February 1, 2016 at 7:37 pm #116749
I took delivery of a 2016 Sierra Denali (5.3 V8, 8-Spd, 3.42) in November and had to take it into the dealer a week later for a transmission issue (coming to a stop the truck would shudder as though the transmission was shifting hard into first gear or as though the engine was about to stall). 3 weeks after taking it into the shop, GMC engineers determined that there was a torque converter problem that was staying engaged too long causing the engine to nearly stalling out when coming to a stop. They okay’d replacing the entire transmission for a new one. I finally got the truck back (a MONTH after first taking it into the shop – and yes, the truck spent 30 days of its first 39 days of ownership in the hands of my dealer) and figured that would be the last of my problems. Since then, I’ve noticed that when yielding – or in traffic/congestion – when I’m slowing down almost to a stop (around 5 mph or lower), then stepping on the accelerator, there will be a long (1 to 2 seconds) delay between me stepping on the accelerator to move and the truck shifting into first and beginning to accelerate. I took it to the dealer again, and they claimed the delay and even “hard” little shifts are normal for this transmission because it is “adaptive” and constantly learning… What? I at first bought it (they are the pros), but I’m beginning to hate not having the confidence of pulling out of a driveway, side street, etc. and being able to immediately get the power and acceleration I need to get out of the way (or better yet to get on my way). Is anyone else here having similar issues with their new GM 8-spd?
February 10, 2016 at 1:18 pm #117903
The 8-sp is a pita for the first 10,000 miles of driving. IMO the problems are the voodoo GM computer programming.
There is another problem looming with the 8-sp; “Shake and shudder on Acceleration Excessive Engine RPM Fluctuation – (Jan 20, 2016)”, all 2015-2016 with 8-sp transmission.
Temp solution, double flush the trans, R & R the filter. If problem is not resolved the problem in internal to the torque converted and new one will be available soon.
If you are driving along between 30 and 65 mph and the vehicle shakes or shudders below 1600 rpms, you have this problem and it will not cure itself. The feeling is like driving over rumble strips on the road. ,
They were supposed to do the double flush, R&R the filter last Thursday on my truck. Has appointment and was talking with someone in the showroom when the SA came up and said, we cannot do it today. The parts dept does not have enough Dexron-HP in stock (only 5 qts) and they called around to 3 other dealers in the area and between them they could only come up with 13 qts of trans fluid, they figure 30 to do the job is adequate. Unbelievable!
Service Bulletin is PIP5337A
btw – I have a 2015 Sierra Denali 6.2L CC standard box 4wd.
February 11, 2016 at 8:10 pm #118429
First post. Hate to see you are having problems. Thought I might be the only one after hearing what service department is telling me. I just bought a 2016 Silverado LTZ with an eight speed and it shifts horrible. Love the truck but not fun to drive while taking off and stopping. Truck has 1400 miles on it because according to service department I have to get my truck to learn my driving habits. I am either a bad driver or have a truck with a learning disability. When truck sits over night or going home from work it always jerks a couple times taking off. Never fails. When I first bought, every time I would stop it would do something that felt like it was still shifting down when I should be stopped and actually feel like a double stop or surge forward. May sound crazy but really is the only way I can explain. There has been a couple times when I pulled into a parking spot to where it felt like I hit a curb because of the way it would stop. I have never experienced anything like this with any vehicle I have ever had. Seems like the computer is not in sync with the transmission at all. I will make turns and vehicle don’t seem to downshift when it should. I truly feel like I am driving a manual shift truck without using clutch. Love the truck and hope enough people speak up so this problem can be fixed. According to my service department vehicle runs as it should. If this is the case I wish I would have kept my perfect running 2013 Ford F-150 4×4.
February 25, 2016 at 3:21 am #121637
The dealer did the TSB (PIP5337A dated Jan. 22, 2016) double ATF flush and replace trans filter on my 2015 Sierra Denali 6.2L w/8-sp trans. Shudder is gone and has not returned in 1,000 miles. There is a new torque converter in the works to correct this condition. When it will be available is not known. You have to keep after the service dept in you dealer. Mine are great, they will do just about anything to please the customer.
Note – Replacing the trans for the shudder does no good because the same torque converter that causes the problem will come with the new transmission so nothing will be accomplished. Tell them to pull up that TSB. The dealers don;t commit every technical service bulletin (TSB) to memory and without an accurate description from the owner may not provide them enough information to search the data base for all issues. In other words, they give up to easily and start throwing parts at it such as a new transmission.
July 20, 2016 at 8:16 am #133650
I purchased a 2016 Yukon Denali in Jan. 2016. It will set in the carport for several days sometime before it is driven. When it sets there for 48 + hours and I drive it, it will back out of the driveway ok, but when I try to accelerate it will pause for 1 -2 seconds, then will pickup and run properly. Runs great until I let it set for the 48+ hours. The first time I called a service manager about this, he said GM had a fix already, but the would have to go into the trans. and replace a “plate”. I told him I would drive it like it is for a while, (my mistake)!
I’ve decided that’s too much to spend on a vehicle with a faulty trans., called him again, left it with them 5 days. “can’t fix it, can’t get it to show the problem” Sent it home, problem still there!! Anyone else having this problem, if so did you get it fixed?
November 15, 2016 at 4:07 am #144432
I purchased a 2015 Sierra SLT with 6.2l and 8 Speed in August 2015 and when it is cold meaning its been setting a day or so, you will almost always get a slip in the transmission causing a several second delay. I had went to a show for my company in Atlanta GA and almost got hit because, I backed out onto the street and when I put it in forward it would not go for several seconds because it just revs up the stairs shudders going forward. I have taken it back to my dealer twice and they cannot recreate the problem so, they have done nothing. I ran into a man at my dealership who was in the process of describing the exact same problem and gave him my business card to see if they fixed his issue. The dealership told him the same thing and he called me yesterday to let me know he and his wife got hit in the Highland NC because, he backed out and could not go forward just like I do weekly in mine. I now have a couple phone videos of mine doing it to show my dealer again but, I am wondering what to do as they have not done anything yet.
- This reply was modified 5 months, 1 week ago by Dirktotten.
August 7, 2016 at 6:17 pm #135441
I’m not experiencing a shudder at speed, only when downshifting into first (when doing a stop and go). I notice it is much more apparent when I first turn the vehicle on after the powertrain has cooled down. My current “work around” is starting it up, putting it into Tow/Haul mode, and driving off. Because it forces to hold first longer and down shift faster, there isn’t a lag or shudder… but fuel economy suffers.
December 5, 2016 at 11:07 am #146075
I just bought a 2017 silverado ltz 6.2/8-speed and I’m experiencing similar issues! If I’m driving 35-55mph every once in a while I get a shudder in the wheel for a brief 1-3sec on and off while I’m at these speeds it’s so frustrating!! The truck has 500 miles on it and my old 1995 silverado with 185k drove with no shudder or vibration issues.
December 5, 2016 at 12:30 pm #146097
I purchased a 2017 GMC Sierra 5.3 with the 8 speed transmission two weeks ago. (This is my 5th GMC truck) no previous problems.
I now have 1000 miles on this truck.
I noticed the truck shudders and seems to have a hesitation between gears, especially at low end. I went in on Dec 2nd 2016 and talked with the dealer who said it takes a while for the transmission to learn my driving habits. What? . It also clunks when taking off. Was told the clunk is normal. This morning Dec 5th i warmed the truck up for ten minutes put it in reverse and the truck would not move. just revved up. 10 seconds later it slowly starts to back up onto the street. I put it in drive and it still won’t go ,just reeves up for another 10 seconds before it finally jumps into gear. Made an appointment to bring it back to the dealer.
This can not be normal for a commercial grade pickup.
December 5, 2016 at 1:29 pm #146105
Mine has clunks every once in awhile but has never slipped like yours, I have yet to take it in the dealer ship, Ive literally only owned the vehicle for 12 days and was so pumped to have a 6.2l truck and now this!!! I paid 60k for the truck and it has a shudder while driving. I can definitely tell its in the driveline and I believe its the trans, Watch your rpm cluster because when I’m on cruise at say 45mph it can’t seem to make up its mind and goes from 1000-1200rpm constantly. My truck does not have a constant shake like the other “Chevy Shake” videos. I only notice it on smooth roads and it drives me nuts. If i take it in I believe they will say there is nothing wrong or in the same case as you say its “Learning”. This is very very frustrating, makes me wonder if my trans will start slipping like yours….
December 5, 2016 at 1:31 pm #146106
By the way my truck is a crew cab short box, when I search issues online all the trucks that comes up are in this configuration.
December 6, 2016 at 9:18 am #146188
Thank you, Ill be curious is to what they say. I started another topic on this issue and got a response from an individual that works at a Cadillac dealer, He said that many of our same complaints are also being brought up there and they have been either replacing transmissions or torque converters to solve the issue….
December 6, 2016 at 6:20 pm #146244
I have a ’17 Denali with less than 500 miles that’s experiencing something similar. If I’m cruising between 35-60mph and I lightly press the gas to maintain speed, I get a violent shudder. I also observe the tachometer bouncing like crazy when this happens.
December 6, 2016 at 6:45 pm #146251
That is what mine does, The service rep tried telling me it could be the V4 to V8 but it’s not! The torque convertor is acting up definitely. I’ve noticed lately 50mph does it the worst for me, but as soon as I either lay into it or brake it goes right away…If I launch from 0-70 it shifts perfectly but if I hover around 50 then slow down to 45 and then speed back up I start to get a shudder in my wheel and sometimes I feel it in the pedals as well.
December 19, 2016 at 9:50 am #147288
I bought it brand new Dec 2015 (2015 High Country 4×4, 6.2ltr V-8) with the new eight-speed Hydra-Matic 8L90 transmission. So I’ve had it a year now and have put 19k + miles it. I noticed about a month ago when the engine was cold and I went from park to drive it felt as if I was parked on a hill and the trans was in a bind, taken 1-2 seconds before roughly engaging in gear. Then it started doing it more often even when the transmission fluid temp was above 130. Well last week it began to shudder almost like driving over road strips before a stop sign. I also noticed that if I had it on cruise control between 40-60mph the tachometer would rev up every time it shuttered/vibrated. It took it back to the dealership as it is still under warranty and had the mechanic ride with me so he could see for himself what my Chevrolet was doing. He knew immediately as to what he thought was causing the vibration…torque converter he says! So as of right now it is in the shop to replace the torque converter with an upgraded one per this bulletin 15389 which provides a service procedure to reprogram the transmission control module (TCM) on certain 2015 model year Cadillac Escalade, Escalade ESV, Chevrolet Silverado, GMC Sierra, Yukon Denali and Yukon Denali XL vehicles equipped with an 8L90 8-Speed (M5U) transmission and 6.2L (L86) engine. These vehicles may have a condition in which transmission calibration allows a higher than target energy input to the torque converter clutch (TCC) under certain conditions. This may lead to faster than expected torque converter clutch material wear, and a shudder feeling.
December 29, 2016 at 1:04 pm #147993
You are not going to like to hear this but this is normal and yes you have an adaptive transmission computer that is constantly adjusting to the way its being driven. You can take it back to the dealer all you want but nothing it going to change as the dealers have no fixes. Its the way the new computerized vehicles operate. It will get better as the miles roll up, give it 20,000-30,000 miles and you will adapt, I did.
2015 Sierra Denali 6.2L 8L90 Crew Cab Standard Box 4WD
February 20, 2017 at 12:10 pm #152614
Before searching for answers, I thought I would have to accept what I was being told about the “adaptive transmission”. I experience most if not all of the issues above, most of the time. Although it brings me no comfort to know others are suffering with the same issue, it is good to know it is not me. So much so that after only 2000km, I am looking forward to an opportunity to get rid of this truck. Had I known when test driving it, or had I been told this would be an on going issue, I WOULD NEVER have purchased it. Unacceptable. As a Past Silverado owner, loved every time I got behind the wheel, now seconds after putting that thing in drive it is like a nothing I have ever experienced, constant shudders, jerks, lugging and jumping. all I can hope now is that someday, a fix will come out, that and I hope the service Dept doesn’t hide when the seem me coming every week. A real shame because I was so looking forward to this truck and now I can’t stand to drive it
April 8, 2017 at 6:50 pm #159600
I bought my 2016 High Country in August 2016, I am experiencing shifting problems from 1st to 2nd gear and sometimes makes an awful clunking noise. I am going to take it into the dealership on Monday to see what they are going to tell me, but by the sound of it, it doesn’t sound like they are going to do anything. Had I known this before I purchased the vehicle, I would never have bought it. I only have 7000 km on it.
- This reply was modified 2 weeks ago by tpanopoulos.
April 13, 2017 at 4:39 am #159911
Clunking is a normal characteristic of GM 6 and 8 speed transmission. Its all computer BS programming to achieve fuel economy. That’s all the matters when building these trucks, make them as fuel efficient as possible even though they may drive like crap. Your driving a computer program.
Mine (15 Denali) still clunks (8-sp) after 35,000 miles. A good friend is in service management at GMC/Buick/Cadillac Dealer. We were talking a few months back about the clunking and he commented, if I had a $ for every customer complaint about clunking, I would be a rich man. Its the way they are.
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