We recently spent a week driving the 2020 Chevrolet Silverado 1500 Duramax – the one powered by the turbo-diesel 3.0L LM2 I-6 turbo-diesel Duramax engine. Much like all-new GM T1 platform that underpins the new Silverado, the straight-six diesel motor is also all-new, rated at 277 horsepower and 460 pound-feet of torque while being mated to the GM 10-speed automatic transmission that sends either to the two rear wheels or to all four.
Many of you chimed in with questions about the truck, and we’re here to provide you the answers. Here we go.
Q: I have heard of overheating issues. Is this true? Are you having overheating issues?
A: A similar question was asked to us when we drove the 2020 GMC Sierra Duramax. Much like we said for the Sierra, we experienced no temperature-related issues while driving the Silverado. In addition, the engine also performed very much like a gasoline unit during cold starts, with the temperature gauge rising to optimal levels after only a short time driving. In other words, nothing alarming was observed. However, we should note that we didn’t perform any towing during this particular test.
Q: Is there an electric version?
A: Not yet. As we write this, there are no mass-production electric pickup trucks on the market, though several carmakers like Tesla, Rivian, Ford and GM have announced plans to bring such a product to market. In fact, General Motors was supposed reveal the much-anticipated GMC Hummer EV in May 2020, but the event was postponed due to the COVID-19 global pandemic.
Besides the GMC Hummer EV, we have also heard whispers of an all-electric Silverado in the works and we expect such a model to become available in the next few years.
Q: How is the NVH of the Duramax engine? How well does it accelerate off the line?
A: Consider us impressed by this new Duramax inline six. Thus far, we have drive it in two different applications – the Silverado High Country being discussed here, and the GMC Sierra Elevation. In both cases, we were very surprised by how quiet and smooth this diesel engine is compared to the competition.
As a matter of fact, we also recently drove the 2020 Ram 1500 EcoDiesel. We not only found the Duramax to be generally more refined than the Ram’s turbo-diesel V6, but a livelier motor, too. Throttle response is considerably better in the Chevrolet Silverado and the engine revs a full 1,000 rpm higher, allowing it to feel more energetic and eager. Off-the-line acceleration is more than ample, mostly due to the fact that the engine produces its 460 pound-feet of torque at just 1,500 rpm.
Q: How does it compare to the 6.2L? Pulling, passing, overall driving?
A: Although the Duramax’s maximum torque rating of 460 pound-feet is identical to that of the available gasoline 6.2L L87 V8, its power delivery isn’t quite as linear as its gasoline counterpart. That said, we weren’t disappointed by the engine’s grunt. Acceleration is brisk, better than the 5.3L L84 V8 due to the fact that torque is available almost immediately, lower on in the rev range. But the Duramax engine still can’t match the smoothness, linearity and high-rpm performance of the 6.2L.
Q: Can you turn off the start/stop feature?
A: Yes. We know that engine auto stop/start has been a source of many complaints from owners of various GM vehicles, and although it hasn’t yet been applied to Chevrolet’s entire lineup, we’re happy to report that yes, one can indeed turn it off in the 2020 Chevrolet Silverado. This is the case for all models and trim levels.
Q: I also want to know about real-world performance, mileage and how that 10-speed transmission works.
A: We performed a similar fuel economy test on the Silverado as when we drove the Sierra Duramax and recorded similar readings. EPA-estimated ratings for the 2020 Chevrolet Silverado Duramax are 29 mpg highway and 23 mpg city. These are actually better numbers than its mechanical twin, the GMC Sierra Duramax, which advertises 22 mpg city and 26 highway. The discrepancy between the two is explained in this GM Authority exclusive.
During our drive with the Silverado, we easily recorded 20 mpg in the city and 25 on the highway, numbers that are considerably better than delivered by the available V8 engines.
As for the ten-speed automatic gearbox, we have absolutely nothing negative to say. In every vehicle we’ve driven with the new transmission thus far, the gearbox has done a formidable job maximizing the engine’s powerband, shifting smoothly and never hesitating to downshift when asked.
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Comments
What is the most endearing feature as to why anyone would want to buy a Chevrolet Silverado with a turbodiesel engine instead of a naturally aspirated V8; does this configuration have a fun-to-drive feature that this configuration Silverado will make buyers want.
1. Driving range
2. Torque availability
3. Less maintenance than a gas / petrol engine
Point 3 seems debatable to me. At least in my own limited experience I’ve had my Diesel Cruze in the shop more than any other car I’ve owned at that age.
Nothing major, but random emissions message when almost new, and a one time “don’t drive your vehicle” message. Both were a little terrifying to me and mysteriously went away with the dealer saying nothing is wrong.
And apparently nothing was, as that was like 20k and 50k miles ago.
Also, the oil changes cost twice and much and the fuel prices negate any savings from the amazing mpg.
Basically the range is the only plus, and I do love the range.
Forgot to mention I just had a recall taken care of that reprogrammed it to make it more likely to alert if it is regenerating too much.
I kind of wish I could have skipped that one.
For towing on a truck, sure maybe it’s better, but honestly I’d just get the gas engine. They’ve towed pretty good in my experience.
Because the 5.3 is uninspiring. Also, this I6 is giving people a lot problems and isn’t very reliable. GM only offers the 6.2 in the upper trims so they can change you for a bunch of stuff I don’t want. I will take an LT with the 2.7 engine.
Thanks for getting my question in. I figured GM’s I6 would be a superior contender in terms of all around refinement. The only thing I’ve seen that can be criticized is how GM designed the serpentine chain belt behind the engine, making it harder to service.
No towing huh? This is a truck afterall
What is the maintenance costs compared to the gasoline options (5.3 and 6.2)??
I have a 2020 LTZ w/3.0 i have a little over 2,800 miles on it and def/guage still reads full? Shouldn’t it have used some by now or do i need to let my dealer look into it?
That’s normal. It won’t report the DEF until it’s like 1/3 left or so. The reason is they don’t want people topping it up because then some of it would always remain in the tank for long periods.
What I do is just put the larger (2.5 gal I think) bottle of DEF in once it starts complaining at less than 200 miles. If you’re planning on a long trip, then go ahead and refill before that if you need.
Bought new 1600 high country Diesel. In the shop more than at my house. At least 7 check engine light. Had steering column replaced. Waited a month for parts. Waited 8 weeks for other parts. Because of strike. Scared to drive long distance.
Oh man, I was kind of hoping the truck owners on here would tell me there is an upside to the diesel. Like, lasts for 500,000 miles or something.
Ok the one you drove did not over heat. But did they FIX the Heating problem that they are having?
You answer was very cryptic about the one YOU drove. So pls answer the Question.
I have one. I LOVE it. I get to abd from work all week on a half tank of fuel. It’s quiet, effortless shifting, good acceleration.
I would like to know how much time, history, work was put into the 10 speed transmission. What will the faults be long term? Recalls? Pressed metal? Like the older trans the pin fell over and rubbed a home in the case. Will it last double the warranty period?
I bought one still wrapped in plastic and have put 25k miles on it. Mileage is about 25 mpg. Best full size truck I have owned. You won’t know a trailer is there. The engine is very quiet for a diesel. I can report absolutely no problems whatsoever and have drove the crap out of it.
Jason, now two years later how has your experience been with your truck??
oui jaimerais savoir moi aussi
I have found that when using cruise control I get 28-29 mpg regularly. I realize that during 2021-2022, we were all getting crappy fuel. My MPG’s went way down and I thought something was wrong with my truck. About four months ago, that changed back and it is getting what it used to when I bought it in March 2020. Love my truck!
I would like specific temperatures. You answer with “temperature gauge rising to optimal levels” does not give me comfort. I have this vehicle and I am not comfortable with the engine running 210 to 225 most if the time. Be specific.
Sounds like you should buy a gasoline engine.
The coolant valve is computer controled so the temperatures will vary. I have found mine as high as 226 then settles down to 210 range. It has never gone over that temp. Now towing it will run around 200. The engine is very impressive connected to the 10 speed transmission. I have 10,000 miles with only 1 issues. A turbo boot torn.
Follow up to my original request/comments. Now that I have been driving this a while, I have some observations. 1) The engine always runs between 210 and 225 under normal driving conditions. 2) When the engine is working harder (towing or on a significant grade) the engine runs cooler – as low as 180-190). The transmission never gets above 200 and usually runs in the 190’s range – towing or otherwise. DEF is a major issue. Towing a 6400lb trailer, I burn up a tank of DEF in 1100 miles. That’s ridiculous. And not towing – maybe 2,000 to 2,500 miles per tank of DEF. The oil needs to be changed every 4,000 miles and DexosD 0W-20 oil has only been available at the dealer. This is not a low cost effective vehicle, but I do like the performance of this engine and have had a “best” 34.6 mpg for a 50 mile average. Not sure I would get the LM2 engine again, but for now, I’m getting used to the hot running temps and it’s getting the job done.
I just did a quick search and average running temperature for a diesel engine is between 210°-230°
I purchased a 2020 Silverado 1500 LTZ I6 Turbo Diesel back in the beginning of May. Before I could take delivery of the truck, a regulator had to be replaced. Then after I purchased and drove the truck for about a week it started leaking fluid and I was told the gasket on the high pressure fuel pump failed. Truck has been at the dealer since then. While I was able to drive the truck it was amazing, but I have serious concerns about how reliable it will be. I plan to tow a boat and go on trips several hundred miles away from home. I really hope I did not buy a lemon.
Don’t feel like the lone ranger Shawn. I ordered a 2020 LTZ I6 turbo diesel and picked it 1/3/2020. About a week layer the AC stopped cooling. I took it back to my dealership the ran diagnostic on it and found out that there 2/o-rings coming off the compressor that were never installed. They fixed that and i haven’t had any other problems. Good luck w/yours. I really do enjoy mine and hopefully will get good service from it. j/m/b
I purchased on in mid-March and starting in June, I’ve had nothing but issues with the temperature and CEL coming on non-stop. The first time the CEL came on, the radiator fan would go full boar as soon as you started it, while driving on flat roads, the temp would bounce from 210 to 240. Took it in the dealer, they said is normal but it’s never been above 200 prior. They said the CEL was for a sensor and they replaced it. Three days and 80 miles later, CEL is back on and radiator fan will not turn on but temp is around 200-220. Went back to the dealer, waited 5 days since they had to pull in the GM technical team, only to find out they will need to replace the intake manifold and it will take 4 days to get the part and 4 days to install it. So it will be at the dealer for at least one more week.
There is an issue and GM knows about it but will only repair it if your truck experiences issues! Truck has less then 4K miles and it now the engine has to be torn apart to fix a major issue. The computer control cooling with no back is a major design flaw and I’m sure trucks are going to be blowing more and more. Love the truck and engine, but it’s got some big flaws! Buyer beware!
Sorry Tyler, mine has none of your problems and mine has about the same mileage 3,874. And runs great and i’m fixing to go on a short 300/mile trip each way next week pulling a 27′ travel trailer. i’ll do another post if i have any problems, Good luck , Tyler on yours.
Sorry to hear about your issue Tyler. A LakeForkGuy, a youtuber I watch, had similar issue with his truck and was able to get the dealership to swap it out for him. Not saying this will happen for everyone but check your local state lemon laws to see if you qualify and put pressure on the dealership to get your truck fixed right. We as consumers should not be treated as if it is our problem when a brand new vehicle has these kinds of issues off the lot. I don’t think most of us can just say, “oh well, guess I will just buy another truck.”
The issue with my truck as a rolled O-Ring on the high pressure fuel pump that caused the oil leak. It only took removal of the entire cab and a 20 hours of labor to fix. Things have been doing well since I got my truck back and will be towing a boat today.
I really do enjoy driving this truck and I think GM put out a good product. I am curious what the percentage of 2020 silverado 1500 diesel lemons will be.
I have a 2020 3L diesel and after pulling a trailer i started having DEF problems saying it was almost empty when i fact it was 3/4 full. My brother has one and he also had this problem while pulling his trailer. Anyone else having this problem?
3.i Duramax sucks for towing. DEF comes on and slows truck to 65 the 55 the 8 mph. Been in shop 5 times and still not fixed. bought to tow boat, leaving in 2 weeks maybe. should have bought a ford
I have the 2020 half ton DM . What is goin on with the def issue when I’m towing lite comes on sayin hav a thousand miles left of def 20 minutes later its 300 miles ? What’s the fix or deal ?
Yes only one time event . Was 1/2 full 1000 mile range went to 80 mile then red empty within 5 miles pulling box trailer . Reported to dealer. Nothing done. Never happened again .now have 6,000 miles. Now im concerned that starting off from stop with 3.0 and 10 speed is slipping on take off. But not sure.
Does anyone have the average cost of an oil/filter change on the LM2? Most dealerships are not posting these. I know you can buy the 7L AC Delco oil kit with filter for ~$51. Not sure what the dealer would upcharge.
I have a 2020 LTZ I6 Turbo Diesel, it is burning about a quart of oil every 2500 mile, is this normal?
Dan, how many miles do you have on it? Mine is also a 2020 LTZ I6 turbo diesel and i do not have any issues w/oil. I only have about 5100 miles on it but we did pull our 27′ travel trailer about 600 miles this summer and i checked it before we left and after we got back and it was still good on oil. I would check w/your dealer about that. Good luck, jb
Not normal. Mine now has almost 8500k miles and has had no issues at all.
We purchased the 2020 2500HD Turbo-Diesel in June 2020. Great truck. Also purchased a new 5-wheel (retirement) 1 week later. Everything was great until October 2020. We were planning a trip to the east cost from the mid-west, and 1 day before we left, we got an alert on the display that said there was an environment system problem and it gave a mileage indication before the power would start to reduce. Took it in for service and they determined the DEF tank/Sensors were defective and parts were put on order, but gave no ETA. Drove the truck from the dealer and put it in my garage. After multiple calls over the next two weeks, never given an ETA, I had a case set up with CustomerCare. According to the owners manual, no legal action can happen until 30 days after the event, though I already contacted BBB and local DA for Consumer Affairs. I asked management at he dealer if GM was still making those trucks and was told yes, but they were special order. That means GM has the parts in their system but would rather install them in new vehicles being made than honor warranty commitments on purchased vehicles. Nice? I have purchased 15 consecutive Chevy products since leaving the Air Force in 1971. I’d say that was pretty good customer commitment. There will not be another GM product for me.
Sorry, you guy’s are having problems w/yours. I’ve only got 6700/mi on mine and pulled our 27′ t/trailer to Eufala and back about 700/mi roundtrip. Def was reading one notch above 1/2 when we got back. Mileage on trip was about 13.6. Best mi/34.1. I normally get 27- 29 making small road trips. I’m retired and i definitely enjoy the great fuel mileage i get and have numerous comments from people how much they like my 2020 LTZ crew/cab. Most were really surprised when they found out it had a diesel in it and were really surprised how quite it is.
I am trying to get a answer to my question on why I can not get 342 gears in a 2021 Chevy Silverado 1500 truck with a 5.3 engine.
Gentlemen, I own a 2020 GMC AT4 with the new 3.0 Diesel. I love the truck, but the engine — at least for me — is a dog. As I write this, it is sitting in a shop in Slidell, LA following a trip to see my family. Here I sit, with no transportation from a truck with less than 10,000 miles on it. This is the 4th visit to the dealer in the past 6 months for “Decreased Engine Power” error message and “service engine” light illuminated. So far, 14-days off the road from summer to now. The decreased engine issue really inhibits driving and it is meant to protect the engine from something two different GMC dealers 1,000 miles apart cannot figure out. So, here I sit at Christmas with no truck to play Santa with. Now I’m getting angry and I’m turning up the Social Media heat on GMC to fix this or take the darn truck back. BTW, this is the 7th GM product I have owned and my wife drives a Suburban. Thanks for letting me vent. Merry Christmas!
See updated comments below… just got the truck back.
I believe they went way to far with this diesel.
I have read about a lot of people complaining about DEF issues and Using a lot of DEF.
Oil usage is another complaint.
I would like to see this engine without the computer controlled cooling valve.
Drop the very low pressure variable oil pump.
Gear drive the oil pump and scrap that stupid belt running in hot dirty oil.
Use at least 5-30 oil
There has been way to many complaints with this engine.
It is at best one hell of a spooky design.
Yes we want a small diesel.
But we want a reliable small diesel.
All the bad engineering on this diesel is a real bad idea.
Rob
I haven’t had one problem. I leave it on the auto shut off mode. Sometimes it uses more def, sometimes less.
Good for you Sabrina. How many miles do you have on it?
Mike I bought a new 1500 w 3.0 can’t seem to get over 22 mpg set cruise yesterday at 74 on freeway 14 degrees outside w/tail wind flat land Minnesota, no stops gets between 21.5 and 22 mpg, I have 7600 miles on it, dealer says it will break in at about 15,000 miles, i find this to be b.s. my first problem the check eng came on and off at 500 miles I took it in to be repaired the dealer said there was a anomaly in my ecu chevy sent them a reprogram for ecu after that light came on again 50 miles later I drove up to Pikes peak and down to Denver light went off then I got over 30 mpg for about 70 mile, I shut truck off when I restarted eng light came back on 1,000 miles later I got back home took to home dealer after 2weeks they had replaced inner cooler pump 2 times ecu once finally fouind bad fuze block for cooler motor, then at 6900 eng light came on after over a month dealer replaced Turbo, saying gate wasn’t moving, I had to leave truck in Colorado the light came on it gave me 175 miles before it would limit speed to 65mph after it did that it then limited to 55mph so I left my truck in Colorado, 2 months later I got it back in Minnesota, truck runs good, can’t tell the difference in running but it still only gets 21 to 22 mpg, any ideas what to do?
Wow… sorry for your troubles, but don’t think they’re related to mpg. At 74 mph, I probably get the same. At 65, more like 25 to 26. At 55, I’ll see 28 to 30. I did a shoreline drive going between 45 and 50 mph and my 50 mile average hit 36.4 mpg. I just don’t think you’re going to see the advertised 29 mpg at 74 mph.
My truck easily gets 28 mpg….except then the winter blend of fuel came out and the mpg was way down. I recently got a full tank of non winter blend of fuel and the mpg went way back up. I even took it to the dealer about the problem. Now I know the winter fuel really does change the mpg. Also on summer fuel, my full tank range is about 680 miles. On the winter blend it drops to about 580 mile range. Huge difference.
Saw the recent comments and I just got back from New Orleans, where my 2020 GMC AT4 Diesel with less than 10K miles had been in the shop for approximately 35 days. It was a lovely stay down south with no truck to haul my boat. Thank you GMC! My check engine light and decreased engine power lights have illuminated several times over the past 10 months and I have been without a truck for more than 45 days in less than 10 months of ownership. Once again, I love the truck … when it runs. I have reported my experiences to the BBB for ultimate resolution under the applicable laws. This is my 5th GM truck and I have never experienced anything like this.
Hi Michael Bristow, I really feel for you and i wonder if if the altitude has any thing to do with it? I picked mine up in Jan/2020 and right after i got it i got 34.1 best mileage. I live in north central Florida. I alway’s get 27, 28, 29 and 30 depending on distance and speed. I really have enjoyed mine hope you are Chevrolet figures it out. I did do some research on diesel fuel. Apparently there are 2/different grades. One for winter and the other for summer. Just wonder if you being in Minn. and probably getting a different grade than i get in Florida might effect your mileage. Man, i’m just throwing things out i’m not a diesel mechanic. In my younger day’s i rebuilt my 55 Belair sport coupe 2/dr w/a 327 and 3/speed turbo-hydromatic. But i’m new to the diesel game except for what i read and try to stay informed. Best of Luck, JMB
I guess you should feel good I had my truck for 4 months chevy had it for 64 days, what a competition? Made in Mexico!
I live in the metro Denver area. It’s not altitude. See my above comment.
John, I appreciate your feed back, I have tried many different fuels, in MN we get a blend between #1 and #2 however I spent 3 weeks in California not much change, also drove back home thru Denver, slightly better mileage thru the mountains, I almost got as good with 2018 5.3, I couldn’t be more disappointed, I almost bleed chevy blood.
I am thinking to swap my Toyota Tundra 2020 Limited wish I loved, for a Silverado 1500 diesel, I have owned diesel engines like power stroke and Cummins 5.9 and 6.7, just like diesel engines, what do you can recommend me? Thanks.
I strongly recommend buying a 1500 with a 5.3 gas, I just bought a 3.0 diesel, it gets very little better mpg and costs way more to operate, everything else about it is fine, I have 10700 miles on it and it isn’t getting better mpg, it gets 22.7 or close but when running at higher freeway speeds 5.3 gets much better, I am not happy, it’s not even close to what chevy claims. I have had 3 5.3 gas trucks all of them met their estimated mpg and no down time from service, no engine lights, combined 350,000 miles, my 3.0 has spent well over 2 months in repair shops, no help from chevy they don’t think i know how to calculate mpg, so I am on my own, road tests of chevy and competitors seems to be total B.S., my friend has a new Dodge he is getting 25 mpg, but watch out, take for test ride and look at average mpg over the last 25 miles, it has to be in high twenty’s, I used over 7 gallons of DEF fluid in 2,000 miles only toeing 4500 pound trailer 1/2 of that trip, started trip with 8600 miles on it. DON’T DO IT!
I bought a new 1500 3.0 to get longer distance between fuel stops and something close to 29mpg, but after 10,700 miles I think it should be broke in, I only get around 23 running around 65 to 70 mph after 70 mph drops of real bad and uses lots of def, I took a 2,000 mile trip pulling 4,500 lbs gross low profile 7’inline trailer for 1,000 miles and empty the other 1,000 miles with wind to my back, got 11.5 pulling trailer but only got 20. empty an d a 6,000 ft altitude drop, anything over 70 mph running 16 to 17 mpg, over whole trip used over 7 gallons of DEF, started trip at 8,600 miles finished trip at just over 10,700 miles on truck. fuel mpg over last 8,00 miles is 18.4 gets better mpg running in town, been. in shop over 2 months total totally wrecked 3 trips, no complete trips without time down, I have logged over 350,000 miles on my 3 previous 5.3 gas jobs, they all averaged what was posted on sticker, with 0 time down, what a disappointment, no help from chevy or dealer, they think I don’t know how to calculate mpg. I have talked to dodge owners and they aren’t getting much better, road tests on you-tube must be complete B.S.
Sorry Michael, I traded in my 2012 Avalanche 4×4 w/5.3 and 3.42 rear end. Best milage i ever got was 19.8 on a trip to Yellowstone. That 19.8 was in AZ. I traded for a 2020 LTZ 2/wd 3.0 I6 diesel. It has 3.23 gears and it is consistently getting in the 26-29 mpg range. Best was 34.1 and that was during the break in period. I pulled a 27′ travel trailer last year over 600mi and my best mpg was 15.2 going and 13.6 coming back and i was really dogging it on the way back. I have no complaints w/mine only praise. People still walk up to me and comment on what a nice truck it is and are even more surprised to find out it is a diesel and how quite it is when i start it up for them. The DEF was full on the 600 mile trip and above half full when we got back. I check my mpg on the on board computer and it is as close to perfect as trying to figure it out on a calculator.
I love my 2021 Silverado with the 3.0 ! No issues at all , I have 7 k miles on it and my best mpg is 40.9 while in the city 24! I def fill up in that amount of time so I don’t know if they improved it in 21 but I can haul a 2 axle trailer with a tractor on it like towing a wood splitter lol
John make it 4×4 , much heavier, more stuff turning, but they claim to be driving a 4×4, yes a 2wh drive will get better mileage but certainly won’t do it in the mountains, they also claim to be driving 73 mph, your truck is lighter and lower profile, no real comparison, I would be happy to be in mid twenties just once in a while.
The new 3.0 diesel is a dog of an engine. My GMC AT4 has less than 12,000 miles and it has been in the shop for engine-related issues for 64 of the past 120-days. Perhaps it’s just me and my truck is the one true “lemon” that made it out of the factory. At any rate, I highly recommend the 5.3 or 6.2 engines. This is my 8th GM product in the last 25 years (wife has had 4 Suburbans, me 4 pickups) and they have all been gas — not one major issue like this. This truck needs to be placed down range as an Army Tank Table VIII static target. For those of you who don’t know what Tank Table 8 is — it is the live-fire certification course for tank crews. The M1 was much more reliable than this truck — and more fun!
DKC I have had problems also, I finally am getting high 20s to low thirties, i put PCI controller in it, from thoroughbred diesel, Kentucky went from 22 mpg to over 30 mpg I believe I have a bad fuel pressure controller in my truck, chevy can’t seem to figure it out, I have also had my truck in the shop over 60 days, chevy needs to train techs better on these, they don’t seem to have a clue!
Thanks Michael. Good to hear I’m not in this alone. Be safe.
2020 Silverado RST 3.0L Duramax. Bought in October 2020. 12,500 miles. Rear Main seal blew out, oil everywhere. Seeing this is a common issue and GM has a bulletin out on it. Dealer says 12+ hour repair.
Greg, if you have a copy of that bulletin or the number for it i wish you pass it along. Mine has about 10 ,400 on it and i’m fixing to pull a 27′ travel trailer to Texas about 1,100 mi/each way. So i’m sure i will hit that 12,500 mi. Somewhere in between. Thanks John B
What bunch of idiots designed this engine. Aluminum block diesel, WTF. This will be the new engine design (just like the old vega aluminum block) total fail. Belt drive oil pump. I want to see the engineer who designed this replace the belt. How do you get it around the back of the crankshaft without dropping the crank? It slays me that these manufactures never consult with actual diesel mechanics before building this junk. And YES it is junk.
That’s pretty humorous – comparing this engine to one made a half century ago.
Hey Wally 1, do you have one? I ordered mine in 2019 and got it in 2020. I don’t think you have a clue. Mine consistently gets 29/31mpg. I’ve pulled my 27′ travel trailer over 3,000 miles with No problems. Pulled my boat almost the same w/no problems. Talk is cheap, i can vouch for mine and all the people i have talked w/that have them swear by them just like i do. If you had taken the time to do a little research you don’t have to drop the crank. You do have to pull the tranny to access it. Chevrolet says 150,000/miles or more. I’m going to keep mine and i’ll let you know when i get 150K on it.
Thanks jrdunlop53, I was telling a good friend that afternoon who dropped by for a cold one about this and we both thought you know w/all the requirements that have to be meet w/the EPA and they had to wait an extra year to certify the mileage on this new engine. What is really funny is my friend told me if i plan on trading my 2020 in he wants to buy it rather than me trading it in. His son has one and he has the same high praise for it that i do.
Hey there Richard Robertson, I ordered my 2020 LTZ w/the new 3.0 diesel and i cannot tell you how much i enjoy having bought this truck. I’ve pulled my 19′ deck boat and 27′ travel trailer w/ no issues at all. Good for you on hitting that 40 mpg the best i have gotten is 34.6 and i like the way it stays up there on your dash. I have shown numerous people that and then showed them what it says/shows up and they all say wow that’s terrific and usually say i didn’t know they offered a diesel in a half ton truck. To bad Chevrolet doesn’t run more tv/adds about this engine. I have heard they are going to make it ava/in the Suburban and Tahoe. Which is great but i use my truck as a truck. Feliz Navidad…
Mine is a 21 Silverado
I have a 3.0 durimax 2020 has 39000, miles, the transmission and the turbo went out at the same time. Found out yesterday that the engine is totally junk, also the trans is totally gone. Metal shavings completely threw both. It’s been 7 weeks and they are finally going to make a decision on weather to replace both or get a new truck. I was accused of miss use. I pull a 12 foot cargo trailer twice a week for around 300 miles. I think GM is just trying to get out of fixing it or giving me a new one. This vehicle ran perfect and had more horse power than any half Toni ever drove. I wonder how many other 3.0 trucks are seeing the same thing. It will be at least 8 to 9 weeks before I get it back. Made without any warren tee also. Not good.
I have a 2003 GMC 2500HD. 6L, 4L80E, SLT. 140K miles. running full syn fluids. No unexpected probs ever. Oil undercoated frame 3X. Great truck. The problem with the new 3.0L diesel from GM is the rubber timing belt that must be changed every 100K miles. It is a 13.5 hr job. So expect to pay more than $1K in labor charges. That negates the 30mpg highway miles it gets.