NHTSA opens preliminary probe into more than 870,000 GM vehicles

[jerry455]

Wow, you must really hate yourself to get into a Toyota minivan. LOL. It will be interesting to see how many engines are actually failing. It seems as every manufacturer is having engine problems currently, even Toyota.

 

[jfoj]

Wow, you must really hate yourself to get into a Toyota minivan. LOL. It will be interesting to see how many engines are actually failing. It seems as every manufacturer is having engine problems currently, even Toyota.

I do not hate myself, my WIFE will hate me when the 6.2l Yukon leaves US stranded on the side of the road somewhere. I might be able to get the Yukon repaired and keep it if I am the only one in the Yukon with a DOA 6.2l on the side of the road. If SHE is in the DOA Yukon, Toyota Minivan in the driveway the next morning and the "I told you ......."!

I am guessing nobody else here would have this kind of response or be able to relate to this??

 

[BDM3]

Joining the list. My 6.2 blew yesterday at 50,090 miles on my 2023 Denali. Dealer is replacing under warranty.

 

[BDM3]

Anyone have any sense for whether the 6.2 failures occur only at highway speeds? Most (if not all) of the stories I've read about have occurred on the highway, presumably at or over 65 mph. I haven't read about a failure occurring in town/in stop-and-go traffic.

Mine failed yesterday on the highway. Where I get on for my daily drive is a 70mph zone so I was getting up to speed and at right around 70 it went to neutral and told me to shift to park. I pulled over and did, there was no dash lights or messages, also didn’t hear any noises or see smoke or anything. Took off again and hit 55mph and it failed for good. Shifted to neutral again, then to park when I got on the shoulder and wouldn’t start or go into neutral from there. Still no indication it was the engine but I knew from all I had read on here. Dealer confirmed today.

 

[KMeloney]

Mine failed yesterday on the highway. Where I get on for my daily drive is a 70mph zone so I was getting up to speed and at right around 70 it went to neutral and told me to shift to park. I pulled over and did, there was no dash lights or messages, also didn’t hear any noises or see smoke or anything. Took off again and hit 55mph and it failed for good. Shifted to neutral again, then to park when I got on the shoulder and wouldn’t start or go into neutral from there. Still no indication it was the engine but I knew from all I had read on here. Dealer confirmed today.

Edit -- I see above what year.

Are any of these failing with Carbyte or Range units installed?

 

[Stbentoak]

Had to chuckle at this...my opinion is if you own any internal combustion engine you NEED to check the oil at EVERY fill up...been this way since I started being around engines...

While I do check mine every so often, mine is so boring that I hardly overlook at it anymore. It never changes. It's never anything but full.... And it's dependable as the sun coming up..

 

[Doubeleive]

I do not hate myself, my WIFE will hate me when the 6.2l Yukon leaves US stranded on the side of the road somewhere. I might be able to get the Yukon repaired and keep it if I am the only one in the Yukon with a DOA 6.2l on the side of the road. If SHE is in the DOA Yukon, Toyota Minivan in the driveway the next morning and the "I told you ......."!

I am guessing nobody else here would have this kind of response or be able to relate to this??

nope. wouldn't have bought anything past a 2020 to begin with. I don't care what the jone's have in there driveway
plus with the daily devaluation I may as well toss a $100 bill out the window every 5 days + interest
by purchasing at 5 years old my devaluation is 1/4 of that, most bugs have been worked out already and it probably won't have to sit at the dealer for a month if something breaks down. And I can still buy a decent warranty and trot my happy ass down the road.

 

[Vladimir2306]

nope. wouldn't have bought anything past a 2020 to begin with. I don't care what the jone's have in there driveway
plus with the daily devaluation I may as well toss a $100 bill out the window every 5 days + interest
by purchasing at 5 years old my devaluation is 1/4 of that, most bugs have been worked out already and it probably won't have to sit at the dealer for a month if something breaks down. And I can still buy a decent warranty and trot my happy ass down the road.

Objectively, the T1 rides on the highway much better than the K2. It is more modern, nicer in interior, more stylish in design)) And we only live once, so why limit yourself to modern toys)

 

[BDM3]

Edit -- I see above what year.

Are any of these failing with Carbyte or Range units installed?

The only thing I have installed on mine is the auto stop eliminator. I think just over a year now.

 

[Doubeleive]

Objectively, the T1 rides on the highway much better than the K2. It is more modern, nicer in interior, more stylish in design)) And we only live once, so why limit yourself to modern toys)

for me, because "Money" I would rather spend that $40,000-50,000 (net loss) on more enjoyable things, such as showing my children the natural wonders of this place we call earth.
Also because i am by general definition "poor" and always have been so I have respect for my money that I do earn and spend it wisely (generally).
I can drool over a new car and dream of driving it, but to attempt to live that life is foolish for me. We can travel to those places in a 5 year old car just as well and still have money in my pocket for the next place. In fact we could drive there in a 30 year old car just as well. I struggled with my own thoughts when I sold my last 25 year old car that was perfectly capable of going another 200k without any major hiccups I shouldn't have sold it, but at the same time I did want something somewhat newer that was previously out of reach and the net loss was not as severe.
just like I could buy a pair of $1000 audio speakers or a $10,000 pair of audio speakers
the question I ask (myself) is do I hear $9,000 difference between these speakers?
(I have listened to both) and quit simply I cannot hear $9,000 difference, do they sound a smidge better? sure, but not $9,000 different.
maybe when all of my children have grown and are capable of living on there own 2 feet and I have completed my job as a parent, then if any money I have managed to save is more than what I might need before I die then I can splurge on living in luxury.
do I buy the latest phone or keep my computer up to date? sure because those things are "tools" for me and enable me to continue to be able to provide a income for my family.
just like if I owned a auto repair I would have to buy the new tools to keep my business running and be able to provide a service.
some things though last a LONG time and provide the same level of use. even though it is not the latest and the greatest.
maybe if I worked in a environment where I had to shuttle clients or customers around I would have a great need for the newest car and be able to do that in class and also "write off some of the cost" as a cost of doing business.
just my point of view, from below the poverty line.
I could go buy a new car I have good credit and I have the resources to pay it off, but the loss point of it is what kills it for me.
to each there own, I am not judging anyone, the above is just from my perspective I do not foresee ever winning the lottery or becoming independently rich and I have a responsibility to provide

 

[cjlewis]

For background: 2023 Denali Ultimate. Blown engine replaced @ 16K. Currently have 56K miles (total).

New engine wasn’t part of the VIN recall that was mentioned earlier in this thread.

Does anyone know what triggered that partial re-call by VINs? Seems like GM found something wrong or identified a supply chain or manufacturing issue. Not sure if this is related to the larger investigation though or a “one-off”. Would be interesting to see if engine issues by year are declining or remaining constant.... however we may never know.

 

[jfoj]

For background: 2023 Denali Ultimate. Blown engine replaced @ 16K. Currently have 56K miles (total).

New engine wasn’t part of the VIN recall that was mentioned earlier in this thread.

Does anyone know what triggered that partial re-call by VINs? Seems like GM found something wrong or identified a supply chain or manufacturing issue. Not sure if this is related to the larger investigation though or a “one-off”. Would be interesting to see if engine issues by year are declining or remaining constant.... however we may never know.

So you have any specifics about what happened to the engine at 16k miles?
Spun bearing(s), which one(s), etc

 

[jfoj]

So just putting this info out there for a point of reference.

My 2024 Yukon build date was 8/2024, have not determined if I can actually find the Julian build date easily yet.

The 6.2l engine in my 2024 Yukon has a Julian build date of 24197 which means the engine was built on Monday July 15, 2024. So this could be anywhere from 2-6 weeks before the vehicle was built. Most likely 2-4 weeks before the vehicle was built because often the plants close the last 2 weeks of August for the next model year ramp up and to address any change over in tooling or assembly that needs to be tweaked. But I have found some info that due to the mid cycle refresh the 2025 Yukon production date is scheduled for regular production on Oct 7, 2024 a bit delayed and not unexpect for a refresh model.

Not sure if there is a cutoff window for problems with 6.2l engines for for the 2024 model year vehicles. I read somewhere that the 2025 6.2l were supposed to be "fixed". Not sure what this means and not sure when the 6.2l build dates for the 2025 model year vehicles would have started. Since new model years start usually starts in September, then the engines for the 2025 model year could have likely been built in late July or for the first few weeks of August as a guess, could have been later due to the Oct 7, 2024 production cycle for the 2025 models. But with the run on replacement 6.2l engines, not sure if the replacements are built on the same assembly line and pulled short of some of the last component installation and if any of this would through a monkey wrench in overall delivery and plans for the 2025 models.

This is all based on "typical" production cycles that I have been familar with over the years, but like anything the date ranges could vary.

This info for typical and general maufacturing and assembly windows.

 

[kmcintosh]

For background: 2023 Denali Ultimate. Blown engine replaced @ 16K. Currently have 56K miles (total).

New engine wasn’t part of the VIN recall that was mentioned earlier in this thread.

Does anyone know what triggered that partial re-call by VINs? Seems like GM found something wrong or identified a supply chain or manufacturing issue. Not sure if this is related to the larger investigation though or a “one-off”. Would be interesting to see if engine issues by year are declining or remaining constant.... however we may never know.

I don't remember seeing a recall list.

 

[jfoj]

No recall at this point, only thing that has really been put out there are a few GM bulletins.

The 1st is a Customer Service Program bulletins that is quite a bit "wiggly" for the Oversize Lifter Bores. Does not disclosed specific VIN's or Build Month/Year to the public. Just seems to cover model year 2023 only. But did indicate affected customers would be notified. Rather vague IMHO.

The 2nd is a "Service Bulletin" that references engine Main Bearing Failures for a wide variety of engines over model years 2019-2024. But in this instance for this forum we are primarily focused on the L84 5.3l and L86 6.2l for model years 2021-2024

Seems to be 2 related bulletins.

1. For Oversize Lifter bores and supposedly GM was to notify owners, but I have not heard anyone receiving notification. This is for 2023 model year ONLY based on the bulletin unless another newer version has been released. The resolution of for the VIN's affected by the oversize Lifter Bores is:

"What We Will Do: Your GM dealer will replace the engine. This service will be performed for you at no charge until May 31, 2026. After that, any applicable warranty will apply."

https://static.nhtsa.gov/odi/tsbs/2024/MC-10253536-0001.pdf

2 . For Crankshaft Bearing Failures. This appears to be for BOTH the L84 5.3l AND L87 6.2l from model year 2021-2024! No real info other than referring dealer service personel to other Technical Service Bulletins for "repair information". No discussion if GM will cover any of the costs associated with these problems beyond the original Powertrain Warranty! Best bring a full wallet or get ready to fight this one.

https://static.nhtsa.gov/odi/tsbs/2024/MC-10249946-0001.pdf

I think the NHTSA is looking into these problems to determine what, if anything GM should do if the numbers support a "Recall". If there is not a "Recall" there may be some financial asssitance foer the "Main Bearing Failures"? Seems to me the Oversize Lifter Bores will directly contribute to Main Bearing failure since the main bearings are in the oiling path AFTER the camshafter and lifters!

There may be other "Customer Service Program" bulletins I have missed or not found and/or there may be updated or new "Bulletins" either to support the customer and/or dealers released in the future on these engine failures. Up to possibly including a government mandated "Recall".

 

[TheAgency]

My 2023 Yukon Denali 6.2 just went into the dealer on Monday for engine issues along these lines, presumably for bearing failure but possibly others, though lifters were ruled out. 34k miles, oil changes every 6,000 with AmsOil signature and was always fussy with my fuel quality. The dealer has had it all week and they are still tearing it apart.

I started noticing the engine run rough this past January during a bout of very cold Minnesota weather and chalked it up to outdoor temperature. Then just last week, it started making a noise almost like a "jake brake" when I slowed to a stop or near stop, and then made the same noise again as I accelerated out of it. Once I was up to speed it was fine. Starting it up in the garage, hood open, there would be an extremely noticeable deep knocking noise coming from the middle/bottom of the engine.

Getting very frustrated with these. I had a 2021 6.2L Yukon Denali, equally well-cared for, that had all lifters replaced after about 55k miles.

This is my 9th GM Full Size V8 SUV/Truck and likely my last. The looks and interior of these T1XX are the best in the industry by far, but I'm seriously considering selling it once I get it back and going with another brand completely.

 

[KMeloney]

My 2023 Yukon Denali 6.2 just went into the dealer on Monday for engine issues along these lines, presumably for bearing failure but possibly others, though lifters were ruled out. 34k miles, oil changes every 6,000 with AmsOil signature and was always fussy with my fuel quality. The dealer has had it all week and they are still tearing it apart.

I started noticing the engine run rough this past January during a bout of very cold Minnesota weather and chalked it up to outdoor temperature. Then just last week, it started making a noise almost like a "jake brake" when I slowed to a stop or near stop, and then made the same noise again as I accelerated out of it. Once I was up to speed it was fine. Starting it up in the garage, hood open, there would be an extremely noticeable deep knocking noise coming from the middle/bottom of the engine.

Getting very frustrated with these. I had a 2021 6.2L Yukon Denali, equally well-cared for, that had all lifters replaced after about 55k miles.

This is my 9th GM Full Size V8 SUV/Truck and likely my last. The looks and interior of these T1XX are the best in the industry by far, but I'm seriously considering selling it once I get it back and going with another brand completely.

Yours sounds like the first (I’ve read about) to have given a “warning” that it was about to go.

 

[jfoj]

My 2023 Yukon Denali 6.2 just went into the dealer on Monday for engine issues along these lines, presumably for bearing failure but possibly others, though lifters were ruled out. 34k miles, oil changes every 6,000 with AmsOil signature and was always fussy with my fuel quality. The dealer has had it all week and they are still tearing it apart.

I started noticing the engine run rough this past January during a bout of very cold Minnesota weather and chalked it up to outdoor temperature. Then just last week, it started making a noise almost like a "jake brake" when I slowed to a stop or near stop, and then made the same noise again as I accelerated out of it. Once I was up to speed it was fine. Starting it up in the garage, hood open, there would be an extremely noticeable deep knocking noise coming from the middle/bottom of the engine.

Getting very frustrated with these. I had a 2021 6.2L Yukon Denali, equally well-cared for, that had all lifters replaced after about 55k miles.

This is my 9th GM Full Size V8 SUV/Truck and likely my last. The looks and interior of these T1XX are the best in the industry by far, but I'm seriously considering selling it once I get it back and going with another brand completely.

Sorry to hear about your vehicle. It sounds like you heard the bottom end problem before it hard failed, unless for some reason the noise if from the High Pressure Fuel Pump. Could alse be the thrust bearing going on the crank?

A few quesitons:
Assume you are the original owner?
What weight oil did you run? 0W20, 5W30 or other?
You indicated you were fussy about fuel quality, explain this please? 89, 91, or 93 Octane and a specific brand?
What is the build month and date on the vehicle?
Since your vehicle is a 2023, do you know if your vehicle fell within the "Oversize Lifter Bore" group? Were you ever notified by GM about this issue?

Please update the thread on what the dealer finds as well.

Just trying to gather more context on these failures.

 

[cjlewis]

So you have any specifics about what happened to the engine at 16k miles?
Spun bearing(s), which one(s), etc

#5 and # 6 rod bearings, spun crank case and metal in the oil pan.

 

[cjlewis]

I don't remember seeing a recall list.

https://gmauthority.com/blog/2024/04/some-2023-gmc-sierra-and-yukon-units-will-need-a-6-2l-v8-engine-replacement/