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NHTSA Looking into Reports of Engine Failures in Certain GM Vehicles

BIGR

BIGR

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NHTSA Action Number: PE25001
Components ENGINE, ENGINE AND ENGINE COOLING
Opened From: January 16, 2025–Present
Summary

The Office of Defects Investigation (ODI) has received 39 complaints and a number of Early Warning Reporting (EWR) Field Reports alleging engine failure in vehicles manufactured by General Motors (GM) equipped with the L87 V8 engine. This includes 2019-2024 Model Year (MY) Chevrolet Silverado 1500, 2019-2024MY GMC Sierra 1500, 2021-2024MY Chevrolet Tahoe, 2021-2024MY Chevrolet Suburban, 2021-2024MY GMC Yukon and 2021-2024MY Cadillac Escalade vehicles. The complainants report a bearing failure that may result in either engine seizure or breaching of the engine block by the connecting rod. The complainants report that there is no detectability prior to the failure.

Failure or malfunction of the engine results in loss of motive power of the vehicle, which may lead to an increased risk of a crash resulting in injury and/or property damage.

ODI is opening this Preliminary Evaluation (PE) to determine the scope and severity of the potential problem and to fully assess the potential safety-related issues. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to NHTSA.gov.
 
JayTheCPA said:
Am wondering whether the $$ spent on oil analysis will provide early warning. Catastrophic bearing failures like this usually take time to develop.
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Once I got to researching it some, there are tons of YouTube and forum info on it. Most of the talk is that the silly AFM is causing lifters to fail, along with cams and other components. 5.3 Liter and 6.2 Liter V8s, are really mentioned alot. I don't think the 6.6 Liter in the Heavy Duty trucks have AFM.

Not only does GM have engine issues, there are issues with transmissions.
 
I thought the 6.2 issue was different than the AFM.
My 5.3 has AFM and is the biggest concern of the truck.
If it is the AFM and they win the case- the 5.3 will be soon to follow.

GM had such horrible results from it in media that they changed the name of cylinder cancellation every so often because potential buyers were walking away at dealerships asking does this have AFM and left when found out all had it. So GM “redesigned” and out came DFM. Guess what, same problems. I can’t remember what the names were before AFM but there was one or two.

They did make changes but different parts fail is all. Some ruined cylinder wall and lost compression, mine (2013 5.3) eats the cam & lifters. Either way same results- the horrible chase for slight emissions gains results in shorter engine life.

How bad mine is… is yet to be determined. Cop car for 70,000 miles. So expect a lot of engine idle time.
Hopefully if it does take a dive it doesn’t ruin the whole engine and just a reprogram with new cam & lifters gets it ok. The oil changes should all be shorter than average time by the PD announced maintenance plan. So I cross my fingers.

GM gets away with tons of nonsense every year, just like all the big mfrs do.
CP4 lawsuit anyone? Should have been a pmd/ds4 lawsuit. And cp3 with its injectors for that matter but not enough was known soon enough to be proven in court.

And when you start thinking they don’t actually hide the better option and remove them from public- look up the original donaldson filter made for GM in the first dmax trucks. Out performed everything. Cleaned amazingly well. Lifespan lasted ridiculously long. GM stomped it out from existence. The he replacements plug in no time and need replacement because of it.
 
Will L. said:
I thought the 6.2 issue was different than the AFM.
My 5.3 has AFM and is the biggest concern of the truck.
If it is the AFM and they win the case- the 5.3 will be soon to follow.

GM had such horrible results from it in media that they changed the name of cylinder cancellation every so often because potential buyers were walking away at dealerships asking does this have AFM and left when found out all had it. So GM “redesigned” and out came DFM. Guess what, same problems. I can’t remember what the names were before AFM but there was one or two.

They did make changes but different parts fail is all. Some ruined cylinder wall and lost compression, mine (2013 5.3) eats the cam & lifters. Either way same results- the horrible chase for slight emissions gains results in shorter engine life.

How bad mine is… is yet to be determined. Cop car for 70,000 miles. So expect a lot of engine idle time.
Hopefully if it does take a dive it doesn’t ruin the whole engine and just a reprogram with new cam & lifters gets it ok. The oil changes should all be shorter than average time by the PD announced maintenance plan. So I cross my fingers.

GM gets away with tons of nonsense every year, just like all the big mfrs do.
CP4 lawsuit anyone? Should have been a pmd/ds4 lawsuit. And cp3 with its injectors for that matter but not enough was known soon enough to be proven in court.

And when you start thinking they don’t actually hide the better option and remove them from public- look up the original donaldson filter made for GM in the first dmax trucks. Out performed everything. Cleaned amazingly well. Lifespan lasted ridiculously long. GM stomped it out from existence. The he replacements plug in no time and need replacement because of it.
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There's hope, I know of several police package Tahoes that made it to 130,000 and beyond miles without major issues. I know of one Tahoe with the 5.3 Vortec that has 280,000 miles on it, without any anything being done to it except regular maintenance. I couldn't believe it, but the guy that told me that, lives locally, he's an honest guy. He bought a Tahoe at the State Auction, it had been a Highway Patrol issued Tahoe. The Tahoe had 140,000 miles on it when he bought it and he put another 140,000 miles on it. Actually he had another Tahoe he had bought from the auction and he sold it after driving it for years. I meant to ask that guy about the rev limiter in those Tahoes, if he had stretched their legs out. Most of those police package Tahoes could hit 135 mph or better, I wasn't sure if the State detuned them before public auction.

I could be wrong, but I think when the GM vehicles are operated in the manual shift mode, AFM is turned off?
 
Thanks.
Im not trying to find top speed- don’t need the felony which is 100 here. Haha

Reading up on it, many people chAnge program to keep it off and done it since new but still had the failure.

Ideally we would keep this to 200,000 mile range.

Idk if they changed any tuning or what in this rig. Idk any of the mechanics at their fleet, been wanting to find out incase one can share any insight.

But this as about the normal mileage they replace all the cop cars. They have a wide variety here- tesla to pickups, motorcycles to a mininvan. Boulder City Nvis not the place to go silly on the roads. 15,000 people and 40 very driven cops.
Some really great and some Barney Fife mode.
When they had “gun in school” thing happen here it was less than two minutes before coos were going in. Had the school swept in under 5 minutes iirc. Found the kid, no problems from it and defused everything. Excellent communication to the parents and public. Should be a “how to” for the rest of the country.

I had my issues with them at times but when it came to the school thing- rockstar level applause.

Now I hope the wrench spinners achieved at their work…
 
No ticking in mine. But at stoplight it gets a tiny shake like a misfire - I don’t have a good scanner so it went to a shop and the scanner didn’t pull anything up.
Seems like ignition miss and it isn’t constant. Plan on new plugs and injector cleaner to see if that helps.
 
Realized that I know somebody with the GMC variant that falls within this issue. That truck is an electronics nightmare. I drove it for a 1,000 mile road trip (I was the sole driver) for a delivery and was completely unimpressed with the nannies and disabled them as they were either a nuisance or outright alarming (Hint: do NOT drive with the adaptive cruise control enabled when the road is wet. The system goes nuts when it encounters road spray and acts like you are about to run out of fuel. Use the 'dumb' cruise control mode instead). I have since driven that trip four more times and refused to take that bling-thing. My pre-nanny vehicle with dumb cruise control worked perfect!

The only thing I liked about the bling-mobile vehicle was the heads-up display which showed the speed limit based on location per GPS. Ok, sure it was comfortable, but so were my 1970's European rides.

Just talked with the GMC's owner and the engine issue is now the last straw. He's tired of the alarm triggering for no reason at least once a week and now the spinning grenade of an engine sealed the exit plan. Really is too bad as the previous vehicle was a '12 3/4 ton Suburban. The 6.0 Burb was a good platform. I told him to keep that Burb...
 
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Will L. said:
No ticking in mine. But at stoplight it gets a tiny shake like a misfire - I don’t have a good scanner so it went to a shop and the scanner didn’t pull anything up.
Seems like ignition miss and it isn’t constant. Plan on new plugs and injector cleaner to see if that helps.
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My friend has a 2005 GM SUV of some sort. It has an inline engine, I think it is a six cylinder.
His enjun hadda misfire, IIRC, on random cylinders but dont for sure remember.
He spent some bucks trying to get it fixed. He was about ready to throw in the towel on his vehicle, then, he seen some BS from some online repair guy, this man said to check the battery. I dont remember what the test results came back as but He installed a new battery and the misfire went away and has never returned.
I dont remember but maybe the battery tester showed a bad cell or some such.
 
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