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General Motors Hit With New 8-Speed Automatic Transmission Lawsuit

General Motors is facing a new class-action lawsuit over claims the automaker shipped vehicles with faulty eight-speed automatic transmissions.

GM eight-speed automatic transmission

This class-action suit was filed against GM in the U.S. District Court for the Eastern District of Michigan, Southern Division. According to Car Complaints, the plaintiffs say the GM eight-speed automatic transmissions in certain vehicles “slip, buck, kick, jerk, harshly engage, suffer abnormal internal wear, sudden acceleration, delay in downshifts, delayed acceleration, difficulty stopping the vehicle, and eventually require replacement of the transmission or its components.” These problems are allegedly traced back to an issue with the torque converter that causes excess friction.

The lawsuit also cites more than 60 technical service bulletins and service updates put out by GM regarding the eight-speed transmission problems, saying these documents are evidence GM was aware of problems with the transmission and decided to sell the affected vehicles anyway. Separately, C7 Corvette owner complaint submitted to Car Complaints back in 2015 stated they were told by a “GM insider” that the automaker was ” aware some transmissions are defective and is working on a kit to fix the fluid starvation problem internally,” which is allegedly the reasoning for the shuddering/jerking transmissions.

Numerous class-action suits have been filed against GM over its 8L45E and 8L90 eight-speed automatic transmissions in recent years. The automaker sought to have one of these suits thrown out last August, claiming the transmission problems are related to a design defect and not a manufacturing defect. GM’s vehicle warranties only cover manufacturing defects with parts and components and not design defects. Most of these suits claim all vehicles with these eight-speed transmissions are defective, which would imply a design defect and not a manufacturing defect.

This latest class-action suit calls on GM to reform its warranties to address these transmission problems and also issue a recall for affected vehicles.

The full list of affected vehicles in this class-action suit includes:

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Comments

  1. This tranny is a turd.
    gm engineers have “big guy” moments and those are not covered by warranties.

    Reply
    1. You must think that the 10 speed is also a turd, as it’s Internally almost identical to the 8 speed with some minor changes, the biggest being changing 1 of the gearsets to feature and additional clutch pack. The fluid flow, housing, asymmetrical pump are largely unchanged.

      This lawsuit needs thrown out. The problem has long been discovered that Mobile 1, not GM is responsible for the fluid that didn’t reject water efficiently enough, and that has been fixed,and if you haven’t addressed it by now it’s on you. GM issued fixes to ever affected owner. Toyota doesn’t even do that. It’s absolute BS that the lawyers are going the “design failure” route. Throw the engineers under the bus. Like they never throw themselves under the bus for the team, just everyone else

      Reply
      1. This, plus a thousand. I’m a master GM tech and GM is not at fault for the transmission problems, it’s been Mobil1. They first came out with a first design fluid and that fluid didn’t have the right properties so it creates all these issues. We then flush it with the 2nd design fluid and all is better. Mobil should be hit with this lawsuit, not GM.

        Reply
        1. Then tell me why the problem dosnt go away after the dealer did the flush. GM can make all the excuses they want, fact of the matter is that GM is willing to ruin their reputation and loose customers rather than deal with it like they should. I had one and got rid of it Will not buy another vehicle with that 8 speed transmission

          Reply
          1. It’s most likely the dealer’s fault then. Either they didn’t follow the specific procedure on the flush or follow up with it. I have flushed about 200 vehicles and have not had a problem with a single one because I follow the specific procedure and make sure there’s no shudder or shifting afterwards. The bulletin constantly gets updated with new procedures and relearns so it’s important for dealers to check on this.

            Reply
            1. I have a 2018 g m c ultimate Denali. I have had the transmission flushed by the dealer and it did not solve the problem. They also did a process called relearning or rebooting the computer so more fluid is sent to the solenoids during acceleration. That did not fix the issue either. The dealer has had my truck for over a week now. I have not heard from them and have no idea what they are up to. I wish I would have done more research on the vehicle before I bought it . Transmission issues on a $60,000 + vehicle that has 20,000 miles on it . Not a happy camper!

              Reply
            2. Thomas, this is Daniel.
              Your post is about the only 1 that really makes sense on this whole thread. I belive it does start with a fluid issue. However, letting that go on for too long of period can result in some internal mechanical damage. In which case, what is GM doing about that. I am the second owner to a 2019 silverado 1500. It kicks extremely hard down shifting from 2nd gear to 1st. And all the dealers are telling me is that there is nothing they can do. The truck only has 51K miles and should still be under warranty. Is it possible to get a new transmission due to this issue?

              Reply
              1. I have a 2015 Denali with the 8-Speed. My transmission went at 34,000 miles.

                GM wanted $6000 for a transmission. I wrote a few letters to their customer service folks and worked through a service manager.

                I received a remanufactured transmission with a 100K mile warranty for $1,995.

                I have about 700 miles on the trans so far. It has shuttered twice during this time and hopefully reprograms itself.

                I don’t have high hopes, but my fingers are crossed. 7 July 2022

                Reply
                1. Hi David R, I have a 2015 Acadia SLT. The trans went at 101,000 miles. I believe a few weeks earlier GM would have at least partially paid but not sure. Tranny replaced with a GM factory rebuilt as they had no new OEM trannys in stock! If that’s not telling I don’t know what it. That took a month and that tranny lasted 4 days until it smoked and seized. Waited another month for another rebuilt. This one has been shuddering and bucking at low RPM. Dealer says it’s normal. 20k miles on it and it still runs. Cost me $6400 and comes with 100k mile warranty. My 2008 Acadia lasted 240,000 miles with no trans issues. A bunch of other issues (timing chain, water pump, etc) but not trans. I have an old Mercedes and the trans still runs smooth. I have only owned GMC SUV’s since 2004. I don’t see myself buying another. Not sure why GM engineers can’t up their game like some of the foreign companies have done.

                  Reply
            3. How do I get to be part of this lawsuit? Had so many problems gm finally authorized replacing my 2017 Colorado transmission with what they called a new/rebuilt transmission. Still have same problems.

              Reply
            4. What city are you in? I like to bring my car to you because it’s still doing it since the 2 flushes. I would like to keep my car but the vibration and shuttering is too much

              Reply
          2. I have a 2017 sierra and the dealer did the fluid flush and kept doing a reprogram and trans still has same issues it allways had shifting hard clucking when fully stop vehicle and trans clunking in gear

            Reply
            1. Sounds like they did not reset the transmission adaptive learn and/or further learn the clutches. There’s another procedure to learn the specific clutches to help the shifting issue.

              Reply
              1. You aren’t going to get promoted just because you are sticking up for gm sorry.

                Reply
              2. Thomas, where do you work so I can bring my truck to you?

                Reply
            2. I’ve had flushes reprograms GM will not stand behind there crap. Still having the same problem as you Robert. My 2017 GMC Sierra is the last GM I’ll buy.

              Reply
            3. I have a 2017 Colorado and it’s never been right. It was put in the shop when we first got it. It has been in the shop 4 times for a jumping transmission. It’s never been right. It jumps real bad. It’s only got 50 thousand miles. I gave up on it.

              Reply
              1. I will never buy another GM! I have a 2017 Yukon and currently paying $6000 to replace the transmission. Never have I had issues like this with my vehicles. I currently also have a Nissan Pathfinder with 480,000 miles that runs beautifully. Shame on GM! A recall needs to happen.

                Reply
                1. Same thing with me cost me $6000 unbelievable truck had 75,000 miles on it

                  Reply
                  1. I had to have the transmission on my 2016 sierra rebuilt at 82k. I’ve been complaining about the transmission since day one of owning it. Add me to the list of unhappy costomers who will not buy another one. People can blame the oil or blame whatever makes them happy, bottom line is every other generation gm I owned drove 1000x better well over 100,000 miles. My 99 Silverado drove smoother at 289k on original tranny. These trucks cost too much to be equipped with junk and no legit fix. It is ridiculous

                    Reply
          3. Its GM stamped & Sold under GM. Regardless if your paying big money for a vehicle you expect it to last. Its be different if we assembled the trucks ourselves, but we’re given the transmission GM approved to be in these vehicles.

            Reply
          4. Had mine flushes twice by GM and trans is still screwed up and now I am getting trans codes off and on.

            Reply
          5. Ok, then why isn’t chevy recalling all affected vehicles and providing the flush, that only makes sense. I am going in tomorrow for the flush and fluid change. I just started to feel the shudder. Even if they don’t experience it, I will pay out of pocket if I have to. GM should step to the plate and take care of the customer and then go after Mobil. To say this is Mobil’s issue and not GM’s is just wrong.

            Reply
            1. That is just GM’S way of doing business. Go for the short term profit and not worry about the long term effect. The way I see it in the long run it if you lose your customers you lose your profit. Then what they sit down on their empty money chest.and think how they should have treated their customer. There is this thing called taking responsibility. Apparently no one at GM has ever heard of it.

              Reply
              1. No, they just ask the federal government for some more bailout money

                Reply
          6. I just bought a 2022 Silverado and after 2,000 miles the trucks displays all of the shutter, erratic shifts and seems to want to drive it self patterns discussed. Problem still here inn2022 and I feel like I got scammed on this very expensive truck.

            Reply
          7. I have had the dealer”flush” AND changed it again at the dealer after another 60,000 miles and STILL clunking away, hard shifting, hard downshifting as well. I call BS on the “mobile one” excuses!! They claim it is “normal” shifting!!!

            Reply
        2. I also was told by my local dealer that if I paid $229 to have my transmission fluid changed to a new type recommended by GM that all my transmission trouble should be over they are not over and I’m out $229 supposedly they paid the laborThis is in my 2017 GMC Canyon

          Reply
          1. My dealer had me pay $700 for my fluid change and I still have the bucking issue in my 6 speed tranny form 2016. They then showed me paper work from GM that said this is expected behavior and said good luck. Been dealing with it to this day.

            Reply
            1. My 2016 Colorado Z71 v6 had the same problem until I found out about 2 service bulletins that address the bucking and poor downshifting (Gm did not notify customers however). The dealer reprogrammed the transmission and engine control modules and the truck now shifts fantastic. The fluid is still the original; your dealer did not perform the proper service if he changed the fluid without reprogramming the transmission and engine modules. The work was performed under the power train warranty at no cost. Find another dealer – you do not need to put up with the poor shifting.

              Reply
        3. After two flushes and a reprogramming, my trans is starting the same issues. And it hasn’t been a year. My service rep told me it has to be flushed every year, and this is unacceptable. I’m also a tech (prototype) and the engineers along with the supplier are responsible. Someone should get on the ball and fix the issue.

          Reply
        4. Had mine flushed and is worse now. So much for it being Mobil 1 fault.

          Reply
        5. These people bought their car from GM, not Mobil 1.

          Reply
        6. Ive got a question as u seem pretty knowledgeable, 93 k1500 suburban with 4l60e. Trans is being rebuilt for the 4th time on 3 months. Keep losing 3 and 4. Have replaced tips and connector as well as pigtail on trans. New harness in trans solenoids my trans guy says he has done everything he knows to correct the known issues and that issue must be in pcm?? Any thoughts?

          Reply
          1. that’s a typical failure for the 4L60e. Never tow in 4th or Overdrive. Install a transmission cooler. Your rebuilder should have already told you about the weakness of the early 4L60’s. He should be upgrading the clutch packs since your having problems or simply upgrading you to the 4L65e which solves all the early weaknesses. (ALL ARE INTERNAL PARTS) And did I say never tow in 4th. I learned the hard way. I Installed a transmission temp gauge that which I now use whenever towing. My current un-serviced all original out of a junk 4L60e has 200k+ miles on it because I watch the temp. Previous rebuilds were lasting almost a year. Quit towing in 4th and it’ll last or pay for the upgrade (parts) to the 4L65.. I plan to rebuild my 4L60 up to the 4L65 when this one eventually wears out. Don’t feel bad, your not the first to learn the hard way on these transmissions, your rebuilder should have advised you.

            Reply
            1. another problem is all that up and down shifting when towing in OD that puts wear on the parts. anytime i am under 50/60 mph in my 2018 silverado i am in 5 gear to prevent all that up and down shifting and it stays out of cylinder deactivation. the newer silverados have a trans temp gauge built in to the display

              Reply
          2. 1993 is the very first model of the 4L60E transmission. The 4L60E transmission has been updated multiple times and your transmission rebuilder should check and install all upgrades or the transmission will keep failing prematurely? I recommend replacing the transmission valve body with a reputable valve body rebuilding company? I do my own valve body rebuilding and updates to successfully FIX the dreaded 3-4 clutch premature failure, there’s so many different areas in the transmission that must be checked and fixed properly?
            To fix the 3/4 clutch ALL PRESSURE ISSUES MUST BE FIXED
            Input drum cracks or internal leaks. Pump pressure issues. Servo and capsule leaking. Valve body internally leaking is one of the biggest problem areas?

            Reply
        7. I didn’t buy a truck from Mobil – they are not who I have a problem with. The truck is from GM – if Mobil supplied them with an insufficient product then they should go after Mobil, not let make the end user deal with it. GM asked for a product with certain specs, and they should have verified that the product met the specs. GM should issue a recall and then have their lawyers deal with Mobil.

          Reply
        8. Not true buddy, going in again for the second flush or torque converter replacement…the fix did not hold up too well

          Reply
        9. Not true, the 2nd doesn’t last either…it clearly is a design and manufacturing issue by GM

          Reply
        10. It’s scary to think GM techs and master techs think there is not an issue other than the fluid lol. Goes to show you the poor service backing up this garbage!

          Reply
        11. Didnt buy the truck from Mobil. My 19 came with with the updated fluid and still has every glitch possible. Its a easy concept to maintain customers. Do right by them and they forget the things that didnt work out. Only been in the repair business 40 years. Just a couple of thoughts

          Reply
        12. So what your saying is gm either didn’t test there vehicle design before selling to the public or they knew about it or they are simply not at fault for something they made and sold to customers? Yup blame it on the fluid makers and not the ones that created the transmission lol,I personally own one of these trucks and gm said since new that it was normal to bang downshifting to 2nd gear ,clunking while putting in gear and shuddering would require not 1 but 7 resets on shifting habits ,fluid swap 3 times and every other excuse in the book and after 4 years of calling and going to dealers they left me out In the dust and now the transmission is dead ,it’s simply stupid to hear that a company that not only made the truck but sold it is not responsible for the defects ,man these company’s are the new version of stupid

          Reply
        13. That didn’t help me. At 58000 miles I started getting the shuddering vibration under load. Fluid and filter change to the “new” Mobil 1 as outlined on numerous TSB’s only made it worse. Now I am staring at a rebuild and only pray that I’m not doing another rebilid at 120000 miles. If so, it will be the first and last GMC truck I own. Which is sad as I otherwise love the truck.

          Reply
          1. Install a Jasper upgraded transmission. Check them out online and call (800) 827-7455.

            They made improvements to the design if you require a whole trans.

            Reply
            1. Thanks Dave, I will. Local shops are telling me I need a complete rebuild and that most likely, I will start experiencing this again in 50 -60K miles and will need another rebuild at that point.
              I have never heard of Jasper but on a quick look, I have two preferred installers in my area so I will look into the improved design.

              Reply
        14. I’ve had transmission issues. Nothing major just something that didn’t seem normal. I took it to a local dealership and they said it needs a new valve body. 2019 Chevrolet Silverado LT Trailboss 5.3L w/ 8spd. I told them I needed a vehicle to drive and the service rep told me I was good to drive it. It’s been over 2 weeks now and no word of when the new valve body will be in since it is on backorder and coming from michigan to indiana. Also on the experience.gm.com/ownercenter/myvehicle when i look at my service records nothing shows up. Is it a requirement that the dealership upload service records?

          Reply
        15. Thomas you are right Mobil1 should have a lawsuit filed against them by GM. After GM replaces all the transmissions they sold to their loyal customers like me. I have a 2018 GMC SIERRA 50K miles and transmission started acting up yesterday. If this is a related problem and GM screws me it will be the last GM product I will ever buy. GM products are all I have ever owned.

          Reply
          1. They will screw you out of your warranty and leave you with a bunch of sad ass excuses ,they dragged me on thinking they would fix it all to wait 4 years back and forth and then being told it’s a design flaw and that I’m stuck with it and there was nothing they could do ,f—k gm ,cheap ass bastards ,screwed me out of a $90,000 truck and had a nerve to throw me to the curb,never again will I buy a gm product ,all there trucks are made with garbage Chinese parts,cheap junk

            Reply
        16. I have a 2021 Colorado with 6800 miles on it. So far its operating like it should… Should I be pro-active and have the trans flushed and fluid replaced BEFORE problems begin ? And is this something that Chevy dealer can do under warranty rather then wait until damage begins, cause once this happens, I’m selling and will never buy another GM product

          Reply
        17. What would you recommend on process and parts? I already changed my temperature sensor and oil ( high end mobile 1) and the issue is back after 4 months

          Reply
        18. I must disagree with you, I have a 2018 sierra that stated having problems and had it flushed out, it still shifts hard and sporadic, I also have a 2019 GMC Yukon xl that at 90,000 mile the transmission started slipping, took it to the dealer and they said yes it is slipping you need a new transmission and by the way we change them out so often that we keep them in stock like oil filters. This transmission is crap and GM needs to make good on it. they want you to pay 60 and 70 thousand for a new rig and it won’t hold up past 100,000 miles. It all BS if you ask me

          Reply
      2. GM sold it , it’s there fault. If GM can blame someone else, sue them. But the consumer shouldn’t have to pay for it!

        Reply
      3. Except in 2019 all vehicles with the 8 speed in the dealer lots still were forced to have their fluid changed as well as the option for anyone who had one to bring it in to change/flush the mobile one fluid out and reset the computers… the problem didn’t even slightly go away…. So the mobile one fluid idea was completely proved wrong.

        The lawsuit absolutely needs to stay…anyone who claims it’s not an issue should be forced to drive one as their daily and maybe even take a long trip and tow trailers… just to see how unsafe they are.

        Reply
      4. I find it amazing that you consider that GM is not to blame for this latest testament to build quality, or lack of it. I know how GM works, and they specified the trans fluid they required, and contracted with the supplier who sold it to them at the lowest cost. GM made this decision, not Mobil.
        I owned a 2017 Colorado that started having problems at 27000 miles. The dealer did the traditional GM “warranty patch” of changing the fluid, in an attempt to get this thing through the warranty period and hopefully not be responsible for anything. I assumed GM had learned it’s lesson on cutting corners on quality, but I guess not. I have purchased GM vehicles my whole life, however, as my son and I were talking a week or so ago, neither of us car understand why. I now own a Toyota Tacoma, and have only visited the dealer for service work. There is a reason Toyota vehicles hold a premium resale value and do not require rebates to sell them. I will NEVER let another GM piece of crap stain me driveway. End of conversation!

        Reply
        1. Gm would have followed up on this case, I have seen this with my experience. This sounds like a crappy service dept that’s cutting corners. If you still had issues after the flush and the warranty was expired, it would still be covered under warranty because of the first complaint.

          Reply
        2. The Toyota dealer in our town keeps getting stack of frames in every once in a while to replace frame problem on their vehicles just saying every Company has engineering problems. It would be nice if this situation will get GM to extent warranty on vehicles affected and reimburse owners that had to pay for repairs.

          Reply
          1. That is probably true, Glenn, however Toyota did not need to be sued to fix the frame problems, as they stepped up to the plate and volunteered to replace rusty frames, unlike GM who has to be persuaded to do something in a court of law. As I previously stated, “never again GM”.

            Reply
            1. I currently have four GM trucks in my stable. I’ve been a GM man since my first car which was a 1976 Malibu Classic and have a long list of General Motors vehicles that I have owned. My 2017 Sierra Denali is currently parked in the garage with a tranny that occasionaly slips. Toyota Definately has stepped up to the plate to take care of their problem and as you stated Bruce, they did it voluntarily! I’m getting ready to jump ship to Toyota just like several longtime acquaintances. I’m waiting for GM to do the right thing, but not for much longer.

              Reply
              1. This is not true do a search, toyotaproblems.com/frame-rust/, and you find Toyota did have class action suit on truck frames.

                Reply
      5. 2017 Escalade Premium Luxury 31k miles

        Purchased it to drive clients around while we wait for the 2021 that turned into a 2022 but still cannot be fulfilled.

        First dealer we took it to after driving it around gave us the BS “We’ve never heard of this before” so they kept it to check it out and just as expected there is nothing wrong with it and its probably just your driving.

        Took it to another dealer and at least that dealer said hey there is an update we have to do. So they changed the valve body. We’ve owned the car 2 years now and have to live with the hard shifts until we get a new model. Its complete BS to say its just a fluid change that fixes the issue.

        You service techs on here saying it no big deal is crap. You only get to see them for 30 minutes on your bay. Try having to explain the crap hard shifts to all your clients everyday.

        Reply
      6. Actually there were numerous cost reduction revisions to the 8 speed that started to seriously affect its performance. The calibration guys worked frantically to try to keep up with changes and get the thing to function decently. The fluid was part of it but far from the true cause. The transmission has now been fundamentally fixed and I doubt any of the current production units still being used will cause customer complaints. The 10 spd transmission co-developed with Ford is a dramatically better design. Ford has had some calibration problems but the GM software and base transmission is “almost” flawless.

        Reply
        1. I like this post, in that the keyword here, as usual with GM, is “almost”. Well put, Bob!

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        2. The 6 & 8 speed transmissions were also co-developed with Ford, and I know this because a friend of mine is on the GM team that worked on it with the Ford guys.

          Reply
          1. The 8 speed is used in multiple vehicles, BMW, DODGE, FORD, CHEVROLET, etc
            The biggest problem is calibration and valve body wearing prematurely?
            I think most problems are lack of training at the dealerships???

            Reply
      7. GM built this transmission and put them in their vehicles. If some component be it fluid or whatever made by a supplier to Gm is the cause of the problem then they should be held responsible for fixing the problem not the customer. Happy customer could be a repeat customer and or bring you new customers. A mistreated customer could have just the opposite effect.

        Reply
        1. Old marketing saying, a satisfied customer will bring you 7 new customers, a dissatisfied customer will cost you 20 customers.

          Reply
      8. The fluid only addresses the Converter Shudder. Mine went away after the Fluid flush and TCM update. The harsh 1-2 and 3-4 shifting remained and are listed in a TSB as being normal. My dealer did not try and replace the converter or the valve body to fix these issues because of the “normal” TSB.

        The torque converter drains overnight and that’s why you get the hard 1-2 shift. It’s a design detail, not a fluid problem. Read the TSB.

        Reply
        1. I have a 2016 and the dealer replaced the fluid and my valve body. Still having problems. I’ve had in in twice since the work was done and it’s still doing it. The dealer said they don’t feel anything. Now that my warranty is done I bet they could find something?

          Reply
          1. If the new Mobil 1 blue label fluid didn’t stop the shudder, replacing the torque converter is the next step.

            Reply
            1. And now that my warranty is up i have to pay for that. I think GM should pay to fix the problem. This is crap.

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      9. Not nonsense, DT, FACT. GM is the Democratic Party of the car building community. Lots of hype and bragging, little substance.

        Reply
        1. With a name like palmer i would expect a stupid politician comment, go stick your head in a toilet

          Reply
          1. I never knew a Miller who had brains enough to scratch his balls, let alone be able to carry on a reasonable conversation with anything other than his dog.

            Reply
            1. Go use your Palmer on yourself, you brought politics in, as usual maybe go vote for something 15 times

              Reply
      10. Uhhh you misinterpreted my “nonsense” comment. GMs response to the transmission problems is pure nonsense. GM engineers admit it’s a design problem and they think we’re dumb enough to believe that relieves them of their recall responsibilities. The entire board at GM is made up of a bunch of complete idiots!

        Reply
      11. My 17 Denali started the thumping on pull out right away. Took it in for service. They replaced the fluid with “better fluid”.
        They said it would fix itself after about 400 miles. They never explained the problem.
        Service guy gave me a copy of the service memo. I have had it back since hoping for a fix. They said they can’t fix it and GM won’t do anything about it. This is the first time I’ve heard about the defect vs design attempt to have the class action thrown out.
        Unless this gets fixed, I won’t be buying another GM.

        Reply
      12. So I have a 2019 Silverado Z71 with the 8 speed transmission. I have had the transmission flush done twice now at my own expense at the dealer where it was purchased ($450 a pop). After each flush the transmission seems perfect for about 10K miles and then we are back to shudder, jerk, and jump. In a truck I paid 55K for I expect much better performance. In addition to the transmission issues mine also burns oil. I end up 2 quarts low at every oil change. I am a long standing GM guy and love their products but this one is not up to par.

        Reply
        1. Mike I have the same year and model vehicle with the exact same problems with transmission and oil burning… would really like to talk to you more about this, has the dealership provided any other fixes? How is it running now?

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      13. My car has been to the dealer countless times and I found that they never changed my fluid. I wonder how many other people this has happened to. My tranny is awful now

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      14. How do I get to be part of this lawsuit? Had so many problems gm finally authorized replacing my 2017 Colorado transmission with what they called a new/rebuilt transmission. Still have same problems.

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    2. i have a 2105 sierra with the 6.2 and 8 speed tranny, when i bought the truck it had 96000 miles on it. after i owned it a while i started noticing the truck shook and jerked.. i looked into some forums and found out that there are 3 computers that need to be flashed besides the mobile 1 upgraded fluid flush.. the first being engine ecm, second being tranny ecm and also read about the power steering ecm.. had all 3 flashed and the mobile 1 upgrade 2 years ago and this truck runs and drives better than it probably did new.. i think most of it has to do with the service by the dealer. i took mine to westside gm in berlin wi and i am 100% happy with the work and the proformance of this truck.. yes was upset at first, yes did cost me 600 bucks on a truck i just bought.. wouldnt sell it for anything now

      Reply
    3. I concur.. I have a 2019 CT6 and it clunks and chugs every day… sucks…

      Reply
    4. I have a 2017 GMC SIERRA. Having the same issues. I have taken it to riverside GMC here in Cartersville ga 3 times. They claim to flush trans the first time. Second time, the claim to flush trans and reset the computer in order for it to learn the gears again after driving it 500 mile or better in order to feel a differents. Well, that didn’t work either. Took it back a third time and said the didn’t find anything at all. Here’s the kicker,, when I purchased the truck, it was in auto mode. Didn’t have an issue. Drove it like this for about a month no problem. Ask my mechanic about it and was told that it should be in 2 wheel drive instead of auto. Well, when I put it in 2 wheel mode, that’s when all heck Brock loose. I think they sold me the truck knowing the issues everybody else is having for the morning of course. I will never buy another vehicle from them again. Karmas a …..

      Reply
    5. My 2017 Chevrolet Suburban1500 with 93,000 miles died of transmission problems with jerking, slipping, vibration and dying in the parking lot at Sam’s.
      After a consult with my local Chevrolet Dealership, I was surprised to learn that this transmission had problems and the replacement cost was over $6000.00
      I’m 76 years old and never had problems like this with my 2003 model which is still running.
      The list price was over $70,000 and I expect GM to recall this transmission or fix it at no cost to the consumer. I’ve been driving Chevrolet since I was 16 years old and this transmission needs immediate attention. #Recall

      Reply
      1. Sorry to hear about it. Mine started up at 6K miles and Chevy wasn’t going to act on the repair. I gave up and bought a Ford. Hopefully, the truck will not have any problems.

        Reply
  2. I would close the doors on my business if I even thought about using the defense “it was a design defect instead of a manufacturing defect” to dodge my customers. Totally lost the plot on giving customers a quality product and experience in return for their money

    Reply
    1. 2016 Yukon XL Denali 8 speed here and I was very disappointed when the transmission started with the rough shifts. Under warranty the dealer did the 1st flush which eliminated 80% of the shift issues (around 65000 miles). At about 89000 miles they had to replace the fluid again in order to replace a sensor in the transmission. Since the 2nd repair its shifts are close to perfect. At 98600 miles, it shifts much smoother than my friends brand new Subaru Forester and a couple of new rental cars I have driven recently. Not sure if it was the 2 rounds of new fluid or the sensor, but it is definitely fixed.

      Reply
      1. Don’t count on this being definitely fixed. You have a fairly high mileage vehicle, and most of these transmissions fail long before this. Baby this rig.

        Reply
  3. GM stupid excuses told with a strait face. How pathetic the management of GM is. Hide behind BS double speak and tell those who bought your cars to GFTS!!!!!!!

    Reply
    1. My 2016 Silverado has been flushed twice and had the torque converter changed… Still the same exact issue.

      Reply
  4. This is disgusting. People pay a lot of money for these vehicles and GM can’t even do their due diligence on making sure that major parts like Engines and Transmissions are operating correctly and that they should last at least 200k miles. They have only been making transmissions and V8’s since the mid 1950’s. Time for GM to get different leadership focused on quality and customer service. I saw another article where CITI is predicting that GM stock will hit $96.00, how can that be with all the numerous class action lawsuits and major recalls that GM is experiencing?

    Reply
  5. It probably gonna get thrown out like the other lawsuits. If GM gave a real fix to the transmission which seems to be the case, what’s the problem?.

    Reply
  6. No excuse! Don’t we have lemon laws for that? My wife had something much more dangerous. Remember the Ford Pinto / Mercury Bobcat with the exploding rear end? A nice rearender with a full gas tank and a hot muffler next to it.

    Reply
  7. How do I go about joining this lawsuit? I’ve had numerous issues with my 2019 GMC Sierra Limited transmission. I’ve also had it in 3 times for the 4WD actuator, the last time in the actuator motor was seized.

    Reply
  8. sounds similar to the excuse Ford used for the dual clutch transmission in the Focus

    Reply
  9. This transmission is junk. And GM’s response to this is why they are not regaining a dominate market position in the US or abroad.

    I wouldn’t trust them with an EV either.

    Reply
  10. I own 2016 GMC Sierra 5.3 it has 113,000 miles. My transmission is shuddering when it shifts to 3 gear it makes a banging noise. I have changed the fluid wits dextron 6. Didn’t make a difference. Still acting weird.

    Reply
    1. 2017 Silverado with a 8 speed transmission. Shortly after purchasing the unit new I had returned it to the dealership because of shifting issues. They kept the truck for almost 2 weeks and ended up replacing the transmission. Upon driving the vehicle after that it still had shifting issues and they kept reprogramming the controller for learning mode and even replace the transmission fluid to no avail. Ended up taking the vehicle to a different dealer and had the transmission fluid replaced with no effect and it got to the point so that every oil change I would go in and complain about the shifting and the reply back to me was it drives normally. The final stake in the coffin for this vehicle was after experiencing several hard shifts where it feels like somebody hits you from the back this happened once with my wife in the vehicle who was astonished to know that nobody hit us from the back and suffered a minor neck pain. After that I said this is not worth it, and sold the truck.

      Reply
  11. I own 2016 GMC Sierra 5.3 it has 113,000 miles. My transmission is shuddering when it shifts to 3 gear it makes a banging noise. I have changed the fluid with dextron 6. Didn’t make a difference. Still acting weird.

    Reply
  12. 2017 Chevy Silverado same problem I had the torque converter and all fluids changed at the dealership I bought it from before my warranty went out and I can feel it coming back again. It’s been a year since then oh and how about the lifters that’s another whole other issue.

    Reply
    1. What lifter issue? You mean the few complaints you read on a forum and the occasional people that complain? Geez, there was a manufacture defect that was caught and addressed. Otherwise the problem is less than 1% of all engines made, it isn’t some big issue. All the other manufacturers have their own problems that are larger. Go troll somewhere else…

      Reply
      1. Let me guess, you’re the same guy that defended all the bolts that caught on fire

        Reply
      2. The majority of people who have problems with GM junk usually will trade the vehicle rather than argue the point with the dealer, or God forbid, GM. Usually will trade for another GM product, for some reason. People as a whole, however, are getting smarter, as most working class people can no longer purchase new vehicles, and have to buy used. An educated consumer is GM’s worst enemy.

        Reply
      3. You should change your name from “common sense” to “”dumba’ss” You can have my share of GN vehicles from now on.

        Reply
  13. I have a 2017 GMC Sierra with this problem. it is the worst transmission I have ever driven. I am aware of it evry time I drive the truck and prepare for the jolt every time I drive it. If not fot this transmission I would truly be happy with it. GM needs to step up and admit their mistakes – design defects included.

    Reply
    1. I bet you’ll be buying the new 2022 GMC Sierra huh ? GM knows you not leaving the brand

      Reply
    2. So yours doesn’t vibrate then? My 18 had a weird resonance that wouldn’t go away and led me to trade it in.

      I am floored their defense is “it’s not a manufacturing defect, we just didn’t design it correctly therefore it’s not our problem”. SERIOUSLY?

      Let’s give “Mary no more crappy cars” more awards and bonuses. Maybe they should because she said no more crappy cars nothing about crappy trucks. Then they stopped making cars.

      Gawd what a sh@t show. Now they’re claiming to be the EV leader and the only EV they offer can and has just spontaneously burst into flames.

      Reply
  14. Just never ends with GM, looks like Mary lost all control

    Reply
  15. Look this was a problem for GM from 2015 to 2019. During this time GM had replaced a number of transmissions, Converter and tried several new formulas of fluid from Mobil One. It took till 2019 to find the solution and that was the fluid was letting the Converters glaze.

    The solution was a new fluid GM offered as a free flush that fixed 95% of the issues. It not only prevents the glazing but also would restore the converter from a glazed condition if not beyond repair. If it was beyond the dealers would replace the converter.

    This was a blazing topic on the Colorado and Canyon web site and a number of highly reporting threads on it. After the fix was offered the threads have vanished accept for a few post on trucks that were not taken in for the flush.

    Mpg only has the fluid solved the issue but it improved driveability with no harsh shifts cold and smooth as glass progression today.

    I can say GM did me right as They no question replaced my Transmission and converter in trying to resolve it with a new parts. They then replaced the fluid once it was available with no question.

    Only a few people who drive high miles that were out of warranty had issues on not getting free repairs but even then I have seen some dealers do their best to try to help. Some not so much but that depends on the dealer.

    If there was no solution I could see a case but the reality is GM in this case did work to resolve this as much and as fast as they could but till a solution was tested and proven they did replace a lot of parts.

    GM has muff things at times with no effort to fix it but in this case they were very active to find a solution.

    This is not also an isolated issue as many companies are having transmission issues as we add more gears and new fluids. Moisture has also been an issue is many transmissions as the fluids in some has drawn in moisture from the coolers in the radiator. Audi and VW suffered this.

    Being a victim here to this point I can say my issues were resolved and it cost me nothing out of pocket. Not sure what else I could ask GM to do.

    Their worst issue here was not finding this before it was in production. Shorter development times today are creating these issues for all MFGs.

    Reply
    1. well said

      Reply
    2. C8.R, agreed with all you said.

      Is there any official documentation that mentions that the new fluid restores a torque converter from a glazed condition? (I understand as long as it is not beyond repair.) Not trying to troll, honest question.

      Reply
    3. Just bought a brand new 2022’ 2.7 liter turbo Silverado and have had these issues since day 1 morning start. Good luck getting any help!

      Reply
  16. How about new vette. Just wait few years
    8 speed trans. New novelette. Junk

    Reply
    1. Its a totally different transmisson, the C8 has an 8spd DTC

      Reply
  17. Of course now we’ll get the, hey they fixed my truck, so that makes it ok..never mind all the people who’s truck they didn’t fix after years of living with the violent shuddering, and just traded them in because they couldn’t stand it anymore. Not to mention you’d have to be an idiot to buy a used one because I know people who got the new fluid and it didn’t work. As the lawsuit states, the problem is they kept selling the junk even though they knew they had a problem

    Reply
    1. The fix has been readily available since 2019. It has worked to fix most of the transmissions. You have to be an idiot to be offered a solution and not get it fixed. Even if the fluid fails the converter replacement would resolve it.

      As for building them. Not an option to stop since there was nothing to replace it with. Also not all of them had issues.

      Reply
      1. Dude, the damage is already done. You can replace the fluid, but everything else is jacked up. The fluid stopped mine from shuddering, but it didn’t stop the horrible hard 1-2/2-1 shifting. I felt mine was unsafe to drive, and of course, it was just past warranty. GM didn’t offer a fix. It’s a band-aid. These transmissions fail all the time. They should be held accountable.

        Reply
  18. No surprise. This is just one of the many reasons that GM’s days are numbered.

    Reply
  19. I have a 2019 GMC YUKON

    Reply
    1. Checking to see if my GMC 2019 is on the list
      Charlotte Ross

      Reply
  20. The amount of Camaro’s and Silverado’s I know of personally ruined by this transmission is absurd

    Reply
    1. But those owners will buy newer GM vehicles despite all the problems and in the end GM wins

      Reply
      1. Some will not. I was a semi loyal GM buyer until I got offered a free year of On Star as compensation for a blown engine at 75k on my last GM vehicle. Now Everytime I think about replacing my Ram and look at a GM I think been there done that and got the huge bill as a souvenir. I have come to realize that life is too short to risk buying a problem child

        Reply
    2. The amount of success with the repair is incredible. Had to imagine a fluid has fixed a vast majority of these.

      Reply
      1. Whatever happened with the good ol faithful….4L60E transmission!!!!!
        I got 270000 miles, before I had to get it rebuilt!! Never had the first problem with it….. That was in my 1998 Chevy Silverado Z71!! Im still driving that truck, at 345000 miles! To be sure, I would think GM could get a transmission that would at least be as good as back in 1998….or even better!
        Maybe things were built better back then….who knows!!!

        Reply
        1. No mileage from them anymore with so few gears.

          If it were not for the CAFE we would still be driving a TH400.

          Reply
        2. I have 330,000 miles on my 20 year old 5.3 Z71 and still going. I am considering a new half ton but all the powertrain issues aren’t worth the risk. Therefore, forced to look for powertrains without fuel economy tricks which sacrifice durability. I don’t want to buy a designed for maintenance product, which forces a deeper relationship with the dealershiip. I have other things to do in life.

          Reply
        3. I had a 99. Absolutely the best pickup EVER. The 88-99 Chevy and GMC’s sometimes bring within a few dollars of what they sold for new, and for good reason. Look around as see how many are still doing the job they were designed to do. Really miss that truck.

          Reply
    3. Where can I sign up for class action lawsuit?
      Have this issue with the trans, metal shavings ,dealer called said its bad, trans converter.

      Reply
  21. So you’re saying the people that bought their vehicles in 15 and lived with it for 4 years made out fine, keep trying.

    Reply
  22. I have 2016 Chevy Silverado, Ive had fuild changed out twice for shuttering!! Torque converter changed an it has stopping problems, It shifts funky in first three gears.It also dosent responed when taking off from from a stop !! It takes off slow the like takes off like your hammering it…

    Reply
  23. My 2016 Silverado 1500 is in the transmission shop getting the transmission replaced at 67000 miles feeling mad

    Reply
  24. At 117,000 miles, out of warranty, my 2017 Colorado now requires a $430 transmission fluid flush and refill with the “special” Mobil 1 synthetic fluid in the bulletin for 8-speed transmission shudder. This is NOT the GM I knew and paid over $40,000 to purchase from.

    Reply
  25. Stand behind your products or close your doors.

    Reply
  26. I have 109,868 miles on my ‘17 GMC 4×4 with the 8L90 /8 speed transmission. Having an issue with shifting ad slipping. Had the fluid changed to no affect, still doing the same thing. When will GMC repair this very expensive issue out of my pockets??? PLEASE GMC HANDLE THIS ISSUE!!! ASAP

    Reply
  27. Definitely makes it difficult to stand behind American made vehicles. 2018 Sierra Denali. Spend top dollar and it shakes like the wheels are falling off. Then they flush the transmission fluid. Tell me if it does it again, they will change the torque converter. Would imagine that after 41,000 miles, some damage has already been done!!

    Reply
  28. I felt there was something wrong with my brand new Sierra. The transmission didn’t shift

    Reply
  29. all these problems just to get .5 more MPG.

    Reply
  30. I own a 2019 Colorado. Tranny Flush, New Fluid,
    seems fine. Pull trailers , and everyday use are great !

    Reply
  31. If GM sold the product to a customer and the product fails prematurely, they’re at fault regardless of who made the fluid. The only way they wouldn’t be is if a recall was issued and they made best effort to change the fluid on every affected vehicle. Unfortunately this case will probably get quietly settled or thrown out because it’s GM and they have an incredible amount of legal power. More severe safety failures have occured with their vehicles regarding headlamps and other critical safety features. Unfortunately class action suits for those were dropped. GM will pull the same strings here, which is exactly why I got rid of my suburban, SRX, and ATS within a 2 week period. I can’t work with a company that refuses to honor warranties when the failure should be covered by warranty – clear as day. When GM does the right thing for their customers, I’ll consider buying another vehicle from them.

    Reply
  32. Went round and round with the dealership changing the fluid first then the valve body and lastly the torque converter before we decided to trade it in for a Jeep.

    Reply
  33. Why is an 8 speed transmission or now a 10 speed even needed?

    Reply
  34. Have similar shifting issues with my 2016 ct6.GM should be ashamed of what they’re doing to loyal customers & they’re reputation.

    Reply
  35. Have similar issues with my 16 ct6. Apparently GM isn’t concerned about customer loyalty or its reputation.

    Reply
  36. Ok quick story….I owned a 2016 Camaro SS which had tranny issues similar to what has been noted. Trans fluid was changed first 10K miles, then changed again, then the converter was replaced and “new” mobil 1 oil installed. After all that the transmission operated as smooth as a “cats meow”…no more issues.

    Reply
  37. I bought a new T1 LT in Nov 2019, and had the TCC shudder, took it to the dealership, they were well aware of the problem, did the flush and refill, with the updated Mobil 1.
    The problem was gone immediately and had not returned. They s really is the best truck I have ever owned.

    Reply
  38. My husband and I have both had the new “fluid flushes” done on our cars not once, but twice. The 1st fluid change only lasted around 8 months, or 8k miles. We just had it done again last month on both cars, so we’ll just have to see if it happens again.

    Reply
  39. we’ve had an issue with our 2015 Cadillac SRX & the dealer couldn’t take care of it. Reading the suit, it sounds just like the issues we continually complained about since we got our SRX.

    Reply
  40. Design is mart of the manufacturing process. For GM to mince words is disingenuous. The 8 speed in my 2021 Silverado is junk. It has too much drag when you let off of the throttle and it doesn’t disengage when you let off the throttle after acceleration. Total garbage. I am very disappointed with the drive train in my new Silverado.

    Reply
  41. My extended warranty went out at 100,000my transmission went out at 108,000 radiator was cracked needed to be replaced. Then after 2 months my motor starts misfiring really bad luckily it was just a valve spring. I also had alot of brake problems in the beginning I bought this truck oh and my resivor for the radiator has cracked twice in 4 years. Chevy has had transmission problems for decades but now ots even getting worst and they say it’s the fuild but it’s not it’s the dam torque converter. My 2002 silverado had the same problem with the converter

    Reply
  42. My 2021 Silverado RST 8 speed transmission as been doing these things since the the very fist day I got it.

    Reply
  43. I’m glad. I have had so many issues including the “fix all flush” and a new torque converter. Every issue that Chevrolet “fixes” more pip up as soon as I get my truck back.

    Reply
  44. My god they are stupid. Fix the thing right or get rid of it. Quit giving customers a hard time because of your screw up. They can blame chip shortage all they want for loss of sales, but the real problem is customer satisfaction. They are not satisfied with your products or your service and treatment after the sale.

    Reply
    1. I think the business strategy now is that future EVs will be so great that GM will have to fight customers off with a water cannon. So nickel and diming now will not come home to roost on their new EV utopia. Current customers are just bridge funding until they get this new huge wave of EV buyers

      Reply
      1. Makes absolutely no sense to treat present customers and owners like crap and expect them to support you with the purchase of an unproven vehicle. Their road to success with these new electric vehicles is paved with uncertainty so to make sure they are successful they supply their present customers with faulty vehicles and when they complain they kick them to the curb. Sounds like a good plan to me.

        Reply
  45. GMs EVs are the Edsels of the 21st century.

    Reply
  46. I have a 2019 GMC Canyon Denali. I had the tranny fluid changed out per the service bulletin when I noticed rough shifting between 1st and 2nd gear. No issues since the flush which was done under warranty, no cost to me. I’ve noticed that I do need to wait a second or two when the tranny has downshifted to first gear when coming up to a full stop before proceeding. Reading the above comments about lack of fluid causing the rough shifts makes sense. Perhaps the one or two second wait allows the fluid to move where it’s supposed to?

    Reply
  47. Its amazing to me that 99% of the comments on here are negative remarks about GM’s lack of quality and poor treatment of customers. While all of that is true (and the exact reason I got rid of all my GM cars after being a life-long fan) -this is a GM forum and majority of the comments are slandering their business practices. Someone from GM has to be reading this stuff almost daily and nobody’s doing anything about it because morons keep buying their vehicles out of loyalty, not because they’re good products. GM won’t change a thing to do right by the customers they wronged because idiots keep their cash flowing in. They just don’t care.

    Reply
    1. Some my keep buying product and continue to complain with no results. But there are more people giving up on GM each day. GM may wake up one day and see the writing on the wall but by then it may be too late. Gm’s claim to fame is I make more money per vehicle than you do. Never mind the fact that your vehicles are better than ours and you sell more than we do. We make more per vehicle than you do and that is all that matters.

      Reply
  48. We bought a 2020 Ford Edge ST with the V6 twin turbo and 8 speed transmission. Transmission vibrated, slipped and had hard shifts from 15 miles. Finally found out that 8 speed transmission was co-engineered through a collaboration between GM and Ford. Piece of junk. Not fixable. We did the lemon law and returned it. Too bad. Besides that, was super nice. How that piece of crap got out to the public shows how not putting time into R & D and getting rid of the test track facilities in Arizona , Ect. Caused this. But money is king in this Capitalist society. More money for the shareholders! Yes !

    Reply
    1. For FWD transverse transmissions GM led the design but used the 9 spd version while Ford uses the 8 spd. The 9 speed GM has been flawless.

      Reply
      1. Bob de Kruyff, where did they add the 9th gear ? That GM/Ford transmission had 800 RPM between 2nd and 3rd. Sometimes during higher power shifts it couldn’t shift fast enough and skipped a gear or banged and just plain failed. Lack of fluid can cause this type of issue as mentioned by others. I would have welded up a deeper, higher capacity oil pan if that would have fixed it. But so would the manufacturers. It still wouldn’t have fixed the part throttle vibration though. Felt like the kids put down one back window. Pop your ear drums after a while and drive you crazy. Sad our products suck so bad. Can’t compare any more. Not good…

        Reply
  49. I have the same issue with hard shifting and jerking and I own a 2014 GMC Seirra with the 8 speed transmission.

    Reply
  50. They are all junk…6,8 and 10 speeds! Plus AFM and DFM sucks! GM hasn’t made a good truck in 20 years..

    Reply
  51. Gm doesn’t fix anything they just hire more lawyers to screw their customers.

    Reply
  52. Why do we need an eight or 10 speed transmission. Seems like all the thing does his shift gears with in city driving. A four or five speed should be enough

    Reply
  53. Had a 2016 Escalade with this transmission, one of the reasons GM/Cadillac traded me into a 2018.
    It’s just a horrible transmission. The worst for me was the 2-3 downshift that made it feel as if you’d been rear-ended. There were times it was so bad my head snapped and hit the headrest, definitely could’ve caused mild case of whiplash.

    Reply
  54. Gm sucks anyways

    Reply
  55. Figures

    Reply
  56. I agree the oil is a part of the problem but the oil pump and the parts are substandard I run fully synthetic royal purple top of the line in my opinion I was told to buy a thermal bypass module for the transmission which dropped both my 2015 Tahoe to 45 degrees and my 2017 Silverado 40 degrees both 4×4 and both transmission replaced recently need to find a different oil because royal purple does not make a transmission oil

    Reply
  57. What do you expect from Government Motors? Enough said! I stopped buying their cars in 97′, haven’t had any major issues since, and I had plenty of GM cars for nearly 20 yrs before the switch. 25 years later, I’m glad i made the choice to drop them. Make all the excuses you want, doesn’t change a thing and I’ve saved a ton of money in repairs.

    Reply
  58. Had to replace my transmission 112,000 cost the company i work for around 3,500. Transmission shop said the torque converters are junk .Now i have another 2016 chevy silverado company truck that’s doing the same thing pulled the pan and full of metal it’s only got 75,000 on it.

    Reply
  59. GM has had some great automatic transmissions. Poweglide, TH400, 700r4, and the best, 4l80E. The Allison is a great trans too, but that’s not a GM product. In the race for more overdrives they haven’t made a trans as reliable as the 4L80. I’ve had and been around a lot of 1
    Ton and higher trucks with that trans and they were not treated well, but were incredibly reliable.

    Reply
  60. 2017 GMC Serria with 36k miles experienced shuddering and hard shifting in gears 1-3. Had the fluid flushed twice with high performance fluid and saw minimal improvement. The dealership told me the shudder was good for the transmission and was helping to clean it because I didn’t drive enough. I have sold my truck and switched to Ford. We had previously given up on GM SUVs after repeated issues. Went to a Toyota Sequoia which has been bulletproof.

    Reply
  61. Funny how something as stupid as fluid draws a lawsuit for gm while chrysler tells customers with 3.7/4.7 to eat it when they spit rockers or drop valve seats, or ford with lets call it non serviceable spark plugs cause they break when removed…i guess these are acceptable issues, faulty fluid is not…ridiculous

    Reply
    1. Nobody said that any of those issues are acceptable. If Ford or Chrystler owners didn’t get off their @ss and file a class action suit, then shame on them. GM owners did it, and it was the right thing to do because the big 3 are all guilty of the same crap. There’s a reason that Toyota was about to take the number 1 seat from general motors during the Obama administration and there’s a reason that “unintended acceleration” issue – which turned out to be totally false and not true – was drummed up by the administration at that time and turned into a big spectacle. It was solely to throw Toyota sales off and slander their reliability so that GM could keep their spot. A spot they don’t deserve.

      Reply
  62. I had my 2018 Canyon flushed due to the major bucking. I still have intermittent minor issues. But until I get it to be consistent, the dealer won’t do anything. I’ve been a GM guy all my life…. About ready to Trade for a competitive unit!

    Reply
  63. I bet the techs aren’t doing the adaptive relearn procedure because it’s not paid under labor time for a trans fluid flush and fill.

    Reply
  64. Had a 2015…Sierra, trans was terrible…now I have a 2019 at4 and it is worse. Took it in…flushed…same crappy response, shutter, and clunking. Next pick up will be a ford.

    Reply
  65. My 17 High Country had the issues got the fluid changed right away been great ever since has 128k miles now running smooth. The fluid was the issue

    Reply
  66. This law suit has already been thrown out. My wife is a paralegal and we have been following all these. Most of them have been thrown out of court. Whoever posted this should have done homework first. Now everyone is getting excited over nothing. Good luck.

    Reply
  67. D. White I just bought a 2015 Silverado, and the transmission jerks and slips and the dealer said there’s nothing it. I’ve been experiencing this problem since owning it. How do I join the class action lawsuit???

    Reply
  68. I believe it a design flaw and GM needs to own it! GM put that trans fluid in knowing it’s the best you can buy for a transmission. There is a fix for starving a transmission of fluid, GM design it as it’s you problem.

    Reply
  69. Yeah how do we join this class action, my 2018 Camaro had the A8 stutter I also told them in the morning it bucks soo hard when leaving my driveway from 1st to 2nd that it throws me forward. They said that was normal and I was like uhhhhh

    Reply
  70. Why is this class-action suit only for 2015 to 2019? My 2021 Silverado RST doing all of these things. This should include all 8 speed transmission!!!!!

    Reply
    1. Probably no legal basis to sue until warranty is over and out of lemon law coverage.

      Reply
  71. 2015 Cadillac Escalade Esv…Same Issues Stated Here…I Took It To Modern Chevrolet/Cadillac They Said No Problem…I Said After A Few Days Let Me Take It To Bill Black Cadillac Greensboro…And Low And Behold They Went Threw The Whole Truck…It Was The Transmission…A Brand New Transmission Got Put In…Thousands Of Dollars And Guess What…The Same Issue…Dealer Response…ALL OF THESE TRANSMISSIONS DO THIS…EVEN IN MY TRUCK…UNACCEPTABLE PERIOD!

    Reply
  72. If you think you’re going to escape transmission issues by buying Ford instead you might want to do some research. GM and Ford Co engineered the new 10-speed transmission.

    Reply
  73. I just recently bought a 2017 GMC Yukon it has 91000 miles. Less than a week later this starts to happen. I am really unsure what to do about this issue. If there is a fix I’d love to know so I can have my mechanic look into it. Also what I don’t understand is why Tahoes aren’t listed aren’t they supposed to have the same engine as the yukon?

    Reply
  74. Read an interesting comment here about how the torque converter drains overnight. That would explain why i get a clunk in the morning if I leave too quickly after starting the engine. No issues if I wait a couple seconds and go easy on takeoff. Also, I wait a couple seconds before proceeding when coming to a complete stop, again to avoid the clunk… Good times…

    Reply
  75. What happened to the great Allison Transmissions ?
    They had a better reputation than Ford Trannys !

    Reply
    1. Allison Branded Trans only available in HD models. The Hydromatic 10 speed is nearly flawless in GM calibration. Ford rushed their Verizon out in 2017 I believe and they have had some complaints. I always wondered what took GM so long to use their version, save for Camaro, but now I believe they were making sure it wasn’t plagued like their 8 speed or have the problems Ford had. It was worth the wait. New 10L80/85/90 is fabulous in my opinion and 30K miles experience

      Reply
  76. I think this is why GM delayed wide spread adoption of their version of the 10 spd. They took their tiMe and got the programming perfect. The 10L85/90E is buttery smooth and perfect. Whereas Ford put their 10 speed in everything off the bat, and has had a whole bunch of shifting complaints. I believe GM knew the 8 spd had problems, but limped it along while the tested and perfected the 10 speed for several years. I get it, it really would suck to have this problem, but I would just trade up to a 10 spd vehicle if you can make it happen, you won’t be disappointed! The 10 speed is a fabulous powertrain all 35,000 miles I’ve had one in my 2019 Yukon. Almost bought a 2016 Yukon with the 8 spd… boy am I glad my wife made us wait (she hated the red backlight gauges in the 2016 Denali we almost bought. Ended up with a 2016 6spd suburban for a couple years (had three 6L85’s over the years with no real shift issues (except a harsh downshift every once and awhile). Finally got the 10spd in our 2019 and it is an amazing trans. Trade-up if you can swing it. Sorry to all of you stuck with the 8L85/8L90 for now. Bottom line is the stumble shifting 8spd is now phased out, and unless it can be proven that it will cause an accident, versus just clunky shifting, it will never be forced to recall. It seems GM knew the 8spd wasn’t a perfect component because they were designing the 10 speed already when they started using the 8spd.

    Reply
    1. So they knowingly put a transmission prone to failure in their vehicles? Then hoped people would then put their trust in another trans with even more gears? No one would buy another GM if they had that bad experience with the first one.

      Reply
      1. They 8 spd was a stop gap between they 6L90 and 10L85/90. I think they new it had performance issues, but never have heard it had a high failure rate, just uncommon less desirable operating characteristics. But it’s not widespread. I know several owners of the 8 spd and they say it’s irratic at times, but no failures.

        Reply
    2. @Sdog4127, you sir, are the problem. You are part of the problem, your mentality is part of the problem. It is not okay for a huge corporation to treat their customers like this, and it’s not okay to enable them to do it by giving them even more money for a $hit product. Let’s face it, GM no longer “builds” cars. They haven’t “built” one for about 3 decades. They manufacturer cars now, and they’ve tried to reduce production cost so much, it’s cost them their reputation. People should care enough to hit back, and the only way we can hit back at a company like this is to hit them in their wallet. You, as well as 90% of the people on this thread should just stop buying from GM. Period. Obama should have let them fall flat on their face for being a crappy company and instead, used my tax dollars to bail them out.

      Reply
  77. Having a shudder in my 2017 Ford f150. 10 speed transmission. Shudder between 5-6-7 during upshift. Have had in local Ford dealer already and still having same problem. Scheduled another repair week of January 10-15th. Hope 2nd time is the charm. Will update on repairs as I think GM uses same transmission.

    Reply
    1. Good luck!

      Reply
  78. My 2018 Colorado shudders unless I’m in city and than I lock out 7th & 8th gear, I only have 5800 miles on my truck but it started at 2000 miles. I think it’s the wrong size converter

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  79. I have a 2017 Dinali ..Like the idiot I bought my truck off the lease, then problem with the transmission 65,000 miles, dealer says it was out of warranty, I brought up the pointed the transmission has been problems and it’s all over the Internet, They wanted me to pay $6000 for a new transmission after Hemmed and hoarded They change their mind and GM was going to pay for half of it, And install the new transmission 80,000 miles now on the truck starting to do the same thing….. if there’s a recall on it question do I get my money back? Bottom line the transmission is junk!!!!

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  80. The 6 speeds have the same identical defect and develop the same symptoms that result in failure and needed replacement. My sons 2016 z71 with 114000 miles on it that he purchased from a certified dealership just this last September started surging and bucking and kicking on a trip that he and had taken in the beginning of December. The highway was very hilly as we were driving through the Ozark Mountains. We managed to make it the 300 Miles back home but less than 3 days later the transmission was losing geese and slipping horribly. Upon researching the symptoms we does over customer complaint forums on GMs website of thousands of customers reporting the same problems with their vehicles with the same transmissions and the ultimate diagnosis and repair required to resolve the issue. We contacted GM to file a claim and although the openly admitted to the issue being a well known problem they demanded we take the truck I. To the dealership and pay an addition 150 to have them diagnosis the problem and estimate the repair costs before the claim could even be filed even though both my husband and my son are licensed mechanics working in the trade. So we complied with their demands only to have them tell us that yes it’s a know problem but because the factory warranty was expired they will do nothing about knowingly selling vehicles with defective transmissions. So I filed a fraud complaint for illegal business practices against them with the ftc for knowing selling products with defective transmissions and also with the bbb demanding they stand behind their products that they openly admit to being defective and at least offer to pay for the replacement transmission the responded with an offer for 20% of the replacement cost. My husband and my self took it up with the dealership my son purchased it from and kindly reject GMs insulting offer. The dealership didn’t offer to absorb the repair costs but they did put our son in a new truck so he would be made whole and not have to fork out another 5000 for a new tranny on a truck he just paid 23000 for 3 months earlier. The manufacture openly admits that the are building and selling vehicles with defective transmissions and have been since 2006. They admired that they know of the problem but have not develops a fix for it as of yet but they are actively trying to find one. They know this yet continue to send vehicles out of the factory everyday with the same problems and they refuse to take responsibility for knowingly selling products to their consumers that are inferior and prone to failure and they do not care and refuse to pay for their fraudulent unlawful immoral business practices. I pray the courts find in the consumers favor as GM needs to be forced to either correct the problem at their own expense or to reimburse all the thousands of customers that they have chosen to defraud and steal from. If this was any other company the government would have already intervened and shut them down but because it is one of the big three the government turns a blind eye to this sort of thing and allows it to continue for over 16 years now without any repercussions for their actions what so ever

    Reply
  81. Can anyone give me a contact for the group that has started this lawsuit. Chev trew me out of the dealership and GM Complaints department wont answer the phone!

    Clive McKnight
    Kamloops, BC, canada

    Reply
    1. Looking for the same thing! Hopefully someone has some insite for us

      Reply
  82. Just purchased a 2018 GMC sierra on new years day from a GMC dealership and drove it home 3 hrs on the 2nd, truck started shuttering from 25mph to 70mph, rpm would bounce around while the shutter was happening, felt like I was driving over a rumble strip. All signs are pointing to a torque converter shutter, waiting on the dealership to get back to me. Which they’ve had my truck 4 days and haven’t touched it. Any possible ideas what can be done to make sure I get my truck back in great running order

    Reply
  83. Another lawsuit…. same result!!! Nothing for me!!! GM can take my Colorado and shove it up their arse! I won’t even waste my time telling my story…. let’s just say that this transmission is a joke, and GM KNEW IT! That’s the last GM my family EVER buys.

    Reply
    1. Damn rite they new from the very first x there was a problem but no one listened to the engineering of this trans was bad

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  84. I bought a brand’s new Colorado 2017 drove it 800 miles an transmission problems started an now it’s like a lil bandaid on a reel problems I complained so much that dealership called n an engineer from GM an he drove my truck an acknowledged that there was a problem with transmission well I’ve been thru all the fluid changes only fixed for jus a few more miles for it was rite bac doin it all again to be for reel I’ll never buy a nutr GM products again what wood it take to make me happy is for GM to buy my truck back for what I paid for it plus the inconvenience of being without my truck

    Reply
  85. If you are an owner of a 2014-19 Corvette, you not only have the potential transmission issue, but also a valve lifter issue (also a new class action lawsuit)…
    And if the Corvette is a Grand Sport or a ZO6, you must deal with cracking, supposedly “forged” wheels…
    And, all lawsuits to date have been won by GM, saying it is the customers fault. A SHAMEFUL lack of corporate responsibility… Unfortunately, just a sign of the times.

    Reply
  86. Some dealers only replaced the fluid when there were symptoms. By then the damage could be done and a new trans would be needed eventually, even after triple flushing and a relearn. People saying to blame Mobil only is BS, both should be blamed. I got rid of my ATS because I knew it would eventually have a problem and my car was quickly running out of powertrain warranty. Car already had hard shifts in 1-2 shifts, but dealer could never replicate because it would happen during heavy traffic. Valve body was replaced before the new fluid was provided, so my situation may have delayed the inevitable consistent shutter issue. Plus, paying for the new fluid was over $400, so yeah, took advantage of premium used car prices and sold it.

    I’ll wait until the 10L45 and 10L80s get up in mileage and see if they’re any better before getting another GM car.

    Reply
  87. I also own a 2018 GMC Canyon. Had the shuttering issue and the dealer did the flush and refill. Fine for a week then hard shifts again. Called the dealer to have the flush done a second time and he stated “GM not recommending the flush for a second time so deal with it”. Where do I sign up?

    Reply
  88. I have a 2016 Cameron same problem had the flush still have hard shifts even a little slip in it Again

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  89. We had rented a loaded ‘21 suburban this spring. The wife and I loved it, with 3 kids under 10 the perfect vehicle. At the time she had a 2018 4Runner, nothing tougher than those but she really liked the extra space in the suburban. I liked it too, we had 2 when I was little, ‘77 and ‘84. My dad never had a problem with either. I had found one, had a deal done and she got scared. I was pissed, I wasted time and the truck was great. We read some reviews and she went with a year old Lexus GX 460. I still love older GM and I own 2 older trucks (95 K2500, 84 C3500) but I’m nervous about those transmissions. I’ve had Toyota trucks for 23 years as daily drivers and I’ve never had to worry about that stuff. I hate to start now. Too bad I’d love to have a new crewcab 2500.

    Reply
  90. I have a 2014 gmc denalli that shudders too.Why is the 6 speed tranny being overlooked. I know of 8 people with a 2014 with same issues.

    Reply
  91. I happened to have a 2015 Yukon Denali.After numerous times back to the selling dealer,went to another dealer .After a few fixes they changed the tranny.The car has 55000 miles and since then the tranny was replaced 2 more times so someone didn’t get the memo

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  92. I happened to have a 2015 Yukon Denali.After numerous times back to the selling dealer,went to another dealer .After a few fixes they changed the tranny.The car has 55000 miles .Now over the period of the next couple of years the transmission has been replaced 2 more times .Someone didn’t get the memo

    Reply
  93. I own a 2015 Yukon Denali with 55,000 miles.So after all the trips trips and leaving my car over the years I have had 3 transmissions replaced over that time period.Very frustrating and loss of car .Someone didn’t get the memo on how to fix it I guess

    Reply
  94. 2017 Silverado LTZ with the 8 speed. Took it in the first year I had it and the dealer reprogrammed the TCM. Took it back a second time and they said it was normal. Fast forward to a great months ago….

    I hadn’t heard a peep about fluid revisions or anything until the truck started chirping when it shifts into 5th gear. I started looking into that and ended up reading about the new fluid, etc. I took it in, less than a month outside of powertrain warranty, with 57k miles on it. I had to pay approx. $340 for the flush. It has MUCH better acceleration afterward and some of the shifting issues were better. It DID have a hard shift into 2nd though before I even left the lot.

    The chirping continues along with occasional hard shifts, but now that it’s gotten cold here in MI, I generally hate driving it again. Acceleration and downshifting suck and there’s a shudder that drives me nuts. It’s going back and it better not cost me anything this time.

    Reply
    1. Since you have it documented that they said it’s normal, get your $340 back. Damn trans has to be flushed 3x before they decide that the damage is already done and they put in a new trans with the new fluid.

      Reply
  95. My 2019 CT6 clunks and chugs constantly, dealer says there is nothing they can do about it.. never a smooth ride and at times, feels like the car will stall when turning at slow speeds and decelerating. Sux…

    Reply
    1. If you’re still within powertrain warranty. Dealer is supposed to triple flush with the new oil. If you still have the same issue, even if it’s less noticable, the damage has been done and they replace the trans and fill with new oil. Try another dealer and call GM customer service and complain.

      Reply
      1. Thanks Luis. I am, and they handed me a bulletin Document ID: 5903453
        #99-04-20-002M

        which says he dealers should not attempt to fix and this will not inhibit the performance of the car….
        Did not thing when I bought a $60k car it would be normal to clunk and chug regularly..

        Reply
  96. Just bought a 2019 Colorado yesterday with 16k miles. Could not feel the Shudder/Slip on initial test drive. After driving for a half hour on my way home, could definitely feel it then. Did some research and found that the 8 speeds have issues. Called to get warranty work done from the dealer I bought it from and cannot get in until a month later… Hoping I did not make a $$$ mistake.

    Reply
    1. Where I live you have so many days to give vehicle back if you don’t like. Guarantee that if you tell sales department you want to give back, they will get truck in for repair quickly. They are probably just trying to get it by the days that you have to get by grace period wait a month is nonstarter probably why it was traded in.

      Reply
  97. I have a 19 Silverado w/ 21K miles. At 20K the dealer replaced the fluid. It continued to jerk and lunge in 4wd, especially when turning. They then replaced the transfer case. Problem still exists and they tell me the problem is the clutches are aggressive and it will work itself out.

    Reply
    1. same on my CT6

      Reply
  98. Bought a 2017 Chevy Silverado Z71 with 80,000 miles. Came with the carfax report of all routine services from the 1st owner. Noticed the transmission lags and the shifts between gears are harsh. Especially between 1st and 2nd acceIerating and decelerating. I contacted GM corporate and they were rude about my concerns. They Informed me that the transmission was not their problem. Then I was told that I had to pay a diagnostics fee to have it looked at. I told them about the transmission problems being identical to all the complaints on the forums. The lady told me that I would have to pay for all mechanic fees and the cost of a new transmission if that was in fact the issue. Then she said that if it came back after inspection that it was a manufacturer defect they would “ CONSIDER” possible reimbursement. The transmission is right at $3500.00 and the labor would be between $1500&$2000.00. Not having the funds for a replacement they know they can screw you. And your taking a risk of getting another transmission with the exact same problems. I’ll never buy another Chevrolet again. That buyout they took a few years ago I’m sure has to do with them not wanting to fork money out of their own pocket’s. Oh, and a 35,000 mile drivetrain warranty??? What a joke. Where is the law at that protects hard working citizens from this type of corruption?

    Reply
  99. My transmission just crapped the bed at 114000 kms apparently the sun gear is gone I have a 2019 Canyon with the towing package and I’ve barely used it for anything other than highway driving. I did the fluid at 750000 kms as spec… So close to drivetrain warranty and I’ve never heard of a sun gear failing under light duty on a light truck …the tech did say there were metal particles in the old fluid when it was charnged… dealership wouldn’t even get me a loaner for the waiting period for a new transmission to be shipped to Canada…So I can only hope the new transmission doesn’t follow suit …fingers crossed on one hand middle finger to GM with the other ..

    Reply
  100. I took my 21 gmc sierra into Clift GMC in Adrian Michigan for a 12-1300 rpm vibration. In addition there is a high rpm driveline vibration.
    A tech rode with me and felt the low rpm vibration and once I drove it from stop light the tech said holy crap.

    Long story short they said come get it. Once there the paperwork said unreplicable .. COMPLETE LIE.. (thats what has me the maddest)

    The service manager who is a good person said the felt same thing in another truck in for vibration. Essentially claiming that its within vibration specification.. Wouldnt produce the viration spec,

    I just want my 53000.00 fixed

    Reply
  101. I have a 2019 GMC Black Widow and have had issues from week one which have just gotten worse. All I get from the dealer is this is normal! BS! No it’s not! I don’t care who’s to blame! I buy car from dealer and extended warranty from dealer, car fails dealer fixes!! The point is they know there’s a problem and don’t want to fix it!
    I’ll sell this POS back to them and go buy a Ford!

    Reply
  102. Just left the dealership. They said it’s completely normal and the masterechanic came out and said” Chevy designed the A8 poorly, they didn’t put a release valve on the A8 so the hydraulic fluid builds up in the mornings and eventually releases causing the car to lunge forward or hard shift. I asked him if it would bother anything and he said Chevy says no it won’t ruin the engine. Then he said they designed the A10 to eliminate that problem. But the guy said he’s already had headaches with customers complaining about the A10 and he said the A10 will have loads of problems down the line. So basically he’s saying that these torque converters are trash. I actually trust him because he works on them all day and really explained to me why the A8 is no good.

    Reply
  103. Bought my 2018 off the showroom floor. Noticed my transmission was hitting hard in second gear and I called the service department. He told me to give it 2500 miles and it should work itself out. Did that and it still did the same thing. Went up to the dealership and then they gave me a flyer saying that it was a clutch issue that when you 1st start the truck that it has to fill up with transmission fluid and that’s the reason it does that. Nothing they can do about it. GMC dealer was all about the sale and not telling me the truth about it when I first asked about it. Will absolutely never buy another GMC after this experience.

    Reply
  104. I had a 2017 6.2 high country that he transmission started grinding a 17,000 miles they flushed and put a new converter in it 5,000 miles started it again. I traded it for a 2018 5.3 high country and was told that issue wasn’t happing in the 2018. 25,000 had it flushed. A month later it was rebuilt. It is junk will try to get in that flaw suit and after by a ford

    Reply
  105. How does one go about getting in, on the lawsuit? I have a 17 Silverado and I have had it in a number of times while they claim “we cannot duplicate it”! What a line of BS! I pulled out and it happened, turned right back around and went back into the dealership, only to be told we’ll have to schedule for 3 weeks out!!! So I did, took it on and was told the same BS! It is so frustrating that these companies have our money, now it’s your problem attitude!
    Shutter, hard shift, delayed downshifting and lurching! ALL of the above issues and I am stuck!

    Reply
    1. I agree! I’m told time after time we can’t duplicate this issue! I had a manager in the truck when it happened and he said it was normal! BS!
      GM knows this is a problem and won’t do anything to rectify it! They are hoping to push it out until we are beyond any warranty!
      As far as I’m concerned I’ll never own another GM product and I’m ready to sue!!!!

      Reply
  106. I bought a2015 Cadillac Escalade Premium Nov.2019,A beautiful vehicle in my eyes, Dec.2019 took Escalade to the MG dealership for transmission problems. The MG dealership performed a transmission fluid fluid, I AM HAVEING THE SAME PROBLEMS AGAIN. A few months ago I took my Escalade to transmission shop for service, the transmission inform me I would need a new $5000.00 8 -speed or 10-speed transmission to clear all of the problems. NOT GOOD. I will drive this vehicle until it stop. at this time I will replacement the Transmission. NOT GOOD, NOT GOOD AT ALL.

    Reply
  107. Just replaced the 8 speed transmission at 115000 kms sun gear gone if you can believe it. 10 speed might be a better choice. If they blow at so low kms and it was in a highway drivin Canyon… check to online you will find that as many as 15 percent of the 8 speed transmissions have issues…don’t trade a lime for a lemon as the saying goes. I had to we will see if this one goes in a couple of years…lol should have spent the extra 7000 and got an F150 when I bought it lol ..🤘

    Reply
  108. Just replaced the 8 speed transmission at 115000 kms sun gear gone if you can believe it. 10 speed might be a better choice. If they blow at so low kms and it was in a highway drivin Canyon. Cost me almost 6000 with no assistance from GM except a break on parts an labor of $600 which is not good enough if you ask me
    .. check to online you will find that as many as 15 percent of the 8 speed transmissions have issues…don’t trade a lime for a lemon as the saying goes. I had to we will see if this one goes in a couple of years…lol should have spent the extra 7000 and got an F150 when I bought it lol ..🤘

    Reply
  109. 100% GM Fault!!!
    After Learning of the Problems they did Not Find a Solution Years Ago.
    Changing the Fluid is like a bandaid Coverup. Wake Up GM, Ford is kicking your Azz!

    If GM was ran by someone with balls they would Replace Every 8 speed with a Great Transmission.

    Reply
  110. this is why GM wants to get onto EVs as soon as possible no transmissions to repair.

    Reply
  111. this is why GM wants to get into EVs as soon as possible no transmissions to worry about

    Reply
  112. They just rebuilt the transmission on my. 2020 Silverado with 8 speed at 6500 miles. It wouldn’t go into gear one morning. It was in the shop for a month. I found out they had replaced the valve body prior to my purchase. Still slow to shift after overnight

    Reply
  113. I have a 2016 Camaro, It was all good till it hit 86,000 miles. Then the problems started, torque converter would make sounds like it had loose bolts, drop it to 7th gear and would go away. Had a flush done, and did not help.
    Now I can’t even drive my car, it slips and shudders upon acceleration. Not good. I have been a mechanic for over 45 yrs and never seen anything like this. New fluids that cost 40 bucks a quart it crazy. So I guess I have to take the good with the bad.
    Does anyone know how to get in on this class action law suit? Any info would be greatly appreciated.

    Reply
  114. Just bought a 2022 Sierra 1500 (Diesel) in February. At 288 (yes HUNDRED) miles truck started slowing and wouldn’t go past 50-mph. Within a couple minutes, got a message on dash stating to pull over to prevent excessive transmission failure (something like that). Had to get it towed back to dealer. Tow truck driver said trans fluid was everywhere. Dealer took 6-days to tell us they just filled it back up and that a line was cracked (UNLIKELY). Within 30-minutes of picking it up it happened again. Not only could they not supply a loaner vehicle (again), they said it wouldn’t be until the 10th of April until they’re able to look at it!!! Thing is BRAND BRAND BRAND NEW!!! To add insult to injury, they had hounded me to trade in my 2020 Sierra 1500 (gas) as a trade-in. While I did get a great price for the trade, I’m now without anything! I told them it should be a free replacement on tranny due to the excessive wear more than likely caused to plates/disks etc. They all but laughed in my face. Not sure how to fight this considering I don’t have any “or else” type of leverage to fight back with.

    Reply
  115. 2017 Chevy HighCountry,already paid $6000 to fix fuel management system. the truck never ran smoothly from the get go. Changing gears; it jerks a lot, at times delays to stop. This is safety issue GM must fix this problems..comfort wise its great but machanically; this GM truck is a nightmare. Not worth keeping. I do not think I will buy GM vehicle again, such a shame!

    Reply
  116. I have a 2016 Silverado and just paid it off. The same week I paid it off my transmission went out. Bittersweet moment and now I’m still paying for it.
    So frustrating and at 80k miles no less! Regularly maintained and all! Had I known then what I know now I never would’ve bought it. They’ve definitely lost their touch when it comes to longevity. Shame on you GM.

    Reply
  117. Have a 19 1500 that’s build date uses updated fluid. At 7k miles shudder was very pronounced in any number of light throttle/maintaining applications. Dealer elected to perform fluid flush and relearn even though this truck had the updated fluid from factory. You guessed it truck still has a variety of undesirable characteristics (shudder, intermittent harsh engagements) Have had many new Silverados over the past 25yrs this one because of transmission operation is garbage in my opinion. GM is aware of issues across the board and doesnt seem to be willing to make right by it. Myself and im sure many other bowtie customers are watching to see whom will get are next vehicle purchases

    Reply
  118. Mine jerks. Nothing solves it UNTIL I push the trailer button and then no more harsh jerks or jumps. I’m not sure what this means on the highway but I’m certain that in lower speeds the issue goes away so clearly some type of electronic calibration should be finessed to solve the issues.

    Reply
  119. i think a lot of these trans problems are caused by up shifting to a higher gear too soon to meet emissions.

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  120. My 2015 Silverado 8L90 transmission was lurching. Then just quit pulling left me on middle of a two lane highway with no shoulder to pull over. flashers on still almost got ran over I was out side the truck waving at vehicles coming from behind. I’m 63 with bad knees an I’m deaf. Tennessee hwy 70 this is safety issue not just a design issue. My truck in the shop. Had to get towed April 15 2022. People our going to get seriously injured if the problem is not fix. It not only a cost issue but life threatening issues.

    Reply
  121. My 2019 Chevrolet Silverado has had so many problems it is unreal I am very disappointed

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  122. Well who is going to pay for the damages and repairs in the end because its not the consumers fault. They buy the car and drive it and it all feels great until it doesn’t. Is mobi 1 going to buy me a new trans or torque converter?

    Reply
  123. If a guy buys a truck he expects truck performance. I’m fed up with newer products I’m trying to find me something from the 70s. They were tough dependable vehicles . And if you had a problem you figure it out under the shade tree. I never took a vehicle to shop growing up we found and fixed the problem. It’s too much sh!t on these new vehicles. My 2015 Chevy transmission is out now I’m paying 7000. To get it fixed I’m gonna find me and old Ford that been restored. Or not. .sell that PC of shit I bought two year ago from general motors

    Reply
  124. do these problems show up if you run in tow mode even when not towing

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  125. I had a 5.4 liter triton v8 that I had before my gm and my Sierra makes me miss it… that says allot

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  126. My 2015 Denali left me stranded at 34,455 miles. Had the transmission flushed once. Then On Star couldn’t locate me and the vehicle on the highway or my location in four attempts. I ended up calling my insurance company for a tow after they left me there four hours to find my own way to safety and home.

    Then they texted all night wondering where the frickin truck was… Good grief Charlie Brown.

    Reply
  127. Do a search using “Chevrolet transmissions are junk”, then do it with Ford, then Nissan, then Honda and on and on. There are mountains of articles about how bad they all are but the mountain of articles is the real pile of trash.

    Reply
    1. Correct, except the problem is that chevys have led them to a class action law suit. There is a reason why this issue has not been dismissed legally. No transmission is perfect, but the 8l90 should not have been approved.

      Reply
  128. Same here. Call an attorney.

    Reply
  129. Well here is a knee slapper for all of you. I have been working with GM on my 2016 Camaro that the transmission went out completely. No warning, just said GOOD BYE!! Well they drug it out over a few months. The Advisor finally got back with me,
    I couldn’t really understand what she was saying her phone connection sucked, and has every time she called me. But this time I told her to email me. Never got one. But in the end they cant help me due to the age and mileage of my car. What kind of $hit is that. It is their mess from the beginning. And they knew it. Just REPLACE MY TRANSMISSION AND TORQUE CONVERTER. AT YOUR EXPENSE NOT MINE. I ALREADY PAID FOR IT ONCE.

    Reply
  130. How do I join in on the class action lawsuit? My GMC AT4 is doing the same thing…

    Reply
  131. I bought a 2019 GMC Elevation w/ 8 speed brand new November 2019, not knowing anything about the transmission problems. Bonehead move by me, can’t believe I did that. Found out about the transmission problems 2 weeks later from my father. Freaked out and tried trading it in for a diesel, only put 100 miles on the truck and the dealer low balled me, offered me $29k on a $53k truck. I wasn’t surprised, so I asked if the latest TSB for the fluid change was done to the truck. I was told it was, so I felt better and forgot about it. Fast forward 2 years, 18k miles, shudder, hard shifts, slips and grinds total trash. Dealer comes back and says the truck needs a fluid flush and upgrade to the New fluid. I just about laughed in the guys face and went to look for the greasy salesman who assured me the truck had the updated fluid, he’s no longer with the dealer. Total non-sense smoke and mirror campaign by GM. I feel sick, and ashamed I was duped so badly.

    Reply
  132. I’ve got a 2019 GMC Canyon Denali and a while back I read a comment in the thread above where putting the truck in Trailer Towing mode helps when the transmission is cold. If I recall the thread mentioned the transmission shifting is programmed to maximize gas mileage numbers. Anyway, I started putting the truck in trailer towing mode when starting out for the day with a cold transmission and it really helps. I turn it off once the transmission is warmed up.

    Reply
  133. I purchased a 2018 Colorado with the 8 speed auto,new on November of 2018,at 3000 miles it pukes the converter,replaced it and it did great till about 25000,same thing again.,this time dealer put new fluid in it and said it would fix it,will here I am at 39900 miles and this time they did a partial overhaul on it,took 30 days to get it back,picked it up today with in 30 mins it is slipping in reverse and shifting erratic,goes back to dealer in the morning,all has been covered under warranty and it runs out 11/23 ,been a chevy fan as long as I was buying cars and this has really disappointed me in GM ,

    Reply
  134. I bought my 2021 in dec of 2020 and the transmission issues started 6months after. I have been to three different dealers and they all do the same thing. Set it back to relearning mode and hope it corrects itself. I would have not bought this truck if I knew about this..I am going on a month now without my truck. If this does not fix it ? I will leave GM in the wind

    Reply
  135. everybody should flood gm customer service and demand a total recall. these transmissions are garbage My 2015 c7 corvette has the same issues

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  136. 2015 c7 has the same problems gm said they will send me a free jacket lol

    Reply
    1. My last GM blew an engine few hundred miles post warranty. GM offered me a free year of OnStar to help with my future towing needs.

      What a joke of a company

      Reply
  137. Yeah. I got rid of my 2021 1500 RST. I am not happy about taking the hit but great full about not dealing with it ever again.. That POS has turned me away from GM products for the rest of my life. I suggest everyone turn away from them and maybe they will get the hint.

    Reply
  138. I have a 2017 Sierra, first transmission went out at 71,000 miles, second transmission went out at 153,000 miles and GM will not do a thing. Have been a GM guy my whole life, no more.

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  139. 2018 silverado 59K miles, and i have the slip, shimmer shake in the trany. this is wrong. I’ve been a die hard chevy guy, how do we get this fixed? i spoke with people they told me flush the trany but the problem comes back how do i get on the class action law suite. send me a link.

    Reply
    1. Bg ultra low viscosity transmission fluid ,change your fluid to that and thank me later ,idiots at gm can’t service a transmission properly that they didn’t design and fail to have knowledge to deal with one correctly ,this fluid is the right one for your transmission ,do 2 drain and fills with this and the transmission will drive completely different and shudder will be gone right away as long as you didn’t drive for a long time with this problem as it might destroy your torque converter if so but worth the try first with fluid

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  140. 2017 Colorado Z71
    Only 50,000 KM and 2 months out of warranty

    My truck Shudders and shakes so badly passengers think the truck is gonna leave parts on the road! Dealer quoted $1200 Canadian for the flush. Fluid alone was $700!

    This should be a recall instead of a TSB. Customers are not notified, and dealerships deny or downplay the problem.

    Now I’m out of warranty and down $1200. I hope this is the end of the trouble…

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  141. I took the hit and I dump my 2021 RST…People should avoid these trucks.. Just my opinion. GM loves the deny there is anything wrong with it… methodology.

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    1. What was wrong with the RST. What did the dealer say about it? What did they do for you? How did you get rid of it? How many miles was on the RST? How much did you get for the RST? I have a 2021 RST myself. Thax

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  142. After multiple issues with my 2016 Cadillac ct6 and lack of any helpful support from 3 different dealerships, I’m not going to bother buying any other GM products. Their vehicles, service, and support continue to suck decade after decade. Hell, I’ll buy a Toyota now rather than a GM product. What’s the point of continually trying to support “American” products when they are garbage!

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  143. Same issue with my 2017 Cadillac CT6 Premium Luxury 3.0TT. For $75.000 I would have expected a drive train to work flawlessly. Shifting from Park to 1 and 2 feels like being hit in the rear end. Downshifting is the same. When putting car in Reverse if feels like the engine is about to fall out of the cradle. General Motors won’t do anything to help resolve this issue. They clam this is normal. This will be my last Cadillac if they don’t correct this issue.

    Reply
    1. Did you ever get the ATF exchanged to the Mobil 1 blue label?

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      1. I have done the recommended Mobil 1 Synthetic LV ATF HP fluid flush twice and that didn’t work.

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        1. Usually the next step is to replace the torque converter. Did the dealer mention that?

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          1. I’ve had it flushed twice, replaced the torque converter, valve cover assembly or something, and wiring harness. Issue still remains.

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            1. Check the play in the rear end gears as they mostly come adjusted wrong from factory and harsh engagement due to transmission issues causes this to get worse ,I went through 2 rear axles cause of it and also will break the driverside engine mount in the process ,gm will overlook this and say nothings wrong and plainly they are full of sh-t,also they update a tsb and in that software they put the 2nd gear engagement so low rpm that it’s hardly used anymore and goes straight to 3rd gear thus eliminating most of harshness due to defective transmission issues,cheap way of getting out of replacing the transmission ,I fought for 4 years on hopes and promises and all for them to leave me in the dust and say sorry sir your warranty is expired and had to spend $4700 to rebuild myself

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          2. They would not touch replacement parts and stood by their GM by the book claim. It’s all normal per factory specs. Refuse to do anymore or even look at the class action documentation I provided at the time.
            I had them look at the entire drive line. I even replaced all the factory Goodyear tires at the second trans flush to eliminate that.

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    2. They’re not going to correct the issue. They clearly do not care about customers after the sale of a vehicle. No point in buying foreign made US vehicles any longer. Might as well buy them from whatever manufacturer that will actually stand behind their products!

      Reply
  144. I have a 2019 SIERRA 1500 SLT X31 5.3 with the 8 speed trans. It’s been downshifting very hard when coming to a stop and slipping occasionally. Brought in to GMC today and they did a reprogram of the transmission control module. Now it’s hard shifting on the highway. I’m so angry I could buy a Ford. I called numerous service departments and it seems they all have been directed to play dumb. At this point I’m looking for a trade. Seriously considering a class action suit.

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  145. My 2018 has transmission problems Jenkins an viberating an shifting uncontrollable.

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  146. Bought my daughter a 2017 Camaro and it has the torque converter shutter. Seen previous owner did the flush at 23k and the tsb at 45k and again at 53k. GM should have changed the torque converter. Let’s face it, it is a crappy transmission. I’ve never owned a GM product but my daughter really wanted a Camaro so here I am. I will stick with RAM. I have a 2000 Dakota with 300k that doesn’t shutter. And RAM owned up to the recalled CP4 fuel pump in my 2020 3500. GM should do the same with this transmission. GM SUCKS CHANGE MY MIND!

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  147. I have a 2017 Silverado, I’ve started noticing the same issues about 2 months ago, does anyone know where I can jump on this lawsuit? Any help is good

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  148. I have a 2017 Silverado and I’m starting to have this issues, does anyone know how to get on the lawsuit or try to get GM to fix it?

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  149. Where can I sign up for this class action suit? I have the same issues since day one

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  150. You ALL might as well suck it up! GM screwed you! They were bailed out by tax payer money and screwed you again! Stop buying this garbage and learn you lesson! No lawsuit is ever going to happen because they got their money, could care less, and have the lawyers to prove they don’t stand behind their products! Start buying anything else!

    Reply
  151. Have a 2019 sierra slt. Has 80000 on it now, had trans issues like many here took it back to dealer, the flushed, changed fluid, reprogrammed tranny. Been shifting good for about 30000 mi now. Probably jinxed my self now. Love the truck not the problem of the tranny. Ps had a 2016 silverado and its tranny went out it was junk

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  152. My father left me his truck before he passed(God bless his soul) it is a 2015 Chevy High Country w/8speed trans. Ive noticed some hard shifting when I first start it up and put it in drive. It jumps into gear and then is jerky going into 2nd and 3rd but after it warms up shes good. Im at 130,000 so I know Im passed the warranty plus it in my name now. Any recommendations on what I should do, its a sealed trans the dealer wants 300 for just a flush and fill not including a filter! AAMCO wants 200 for flush and new filter, Id do it myself but I couldnt do the flush since I dont have the equipment. Seems like I should replace as much as possible now before anything happens?

    Reply
    1. No matter who does your transmission you need to use the mobile 1 synthetic LV ATF HP transmission fluid, it’s the only one that will stop the jerking and all the other problems FYI

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  153. I have a 2015 Acadia with a GM 6-Speed 6T75 M7X Hydra-Matic trans. I had the same issues as the symptoms posted for the 8 speed. Spent over $6000 on a factory rebuilt with 100k warranty from the dealer. Went at 120,000 miles. GM did nothing for me since out of warranty. Their engineers suck and I am never buying a GM car again. I have been loyal to the brand for 20+ years. Screw me once….you know the saying. I have a Mercedes now and car runs and drives like a dream.

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  154. I have a 17 Silverado. 173800+ miles. This thing shifted hard from the start. They “voluntarily” changed and flushed the transmission fluid. STILL shifted hard, claimed at first it was “defective” fluid from factory. I have had it changed every 60,000 miles and still shifting hard. It is a JUNK TRANSMISSION in lower gears! But for some reason it still goes. Differential fluids changed, transfer case fluid changed, done everything I can think of. I will drive it til it dies and see what happens with the next truck, Chevy or not.

    Reply
  155. Anybody have a good plan on how to address the dealership to legitimately find out what trans are recalled? I’d like to know the truth before ask the dealership!

    Reply

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