Hi, All

Do any of you have the same problem as me? My car had this problem on October 2nd, and later I found that many of my friends' cars with the same engine model had the same issue.
My car was recalled for inspection on September 11th.
2023 GMC Denali 6.2 Engine
L87 Engine Loss of Propulsion (Related field action: See Special Coverage N252494003)
NHTSA 25V274

However, on October 2nd, the vehicle still broke down on the street. Dealer inspection revealed that the engine lifter and camshaft were damaged. I initially thought this was a recall issue.
I also filed a TCA case, but the vehicle actually passed the recall inspection, meaning I have to pay for the repairs myself. This is utterly absurd.
I also filed a complaint with the TCA, but the vehicle actually passed the recall inspection, which means I have to pay for the repairs myself. This is simply absurd. This is clearly due to a product quality issue, and I've asked many other GMC owners, and they have the same problem. Cadillac Escalades with the same engine have had their free engines replacement, but after the GMC recall, many lifters broke, and they were all required to pay for the repairs themselves.

I strongly recommend that all car owners experiencing similar issues immediately report to the NHTSA, retain all receipts, and fight for out legitimate rights.
https://www.nhtsa.gov/report-a-safety-problem#/vehicle

It passed inspection and then had the exact same failure originally described as the reason for the inspection? Seems like an inadequate inspection was done, either by skill or by design.

It'* probably time to go legal if there is no other recourse presented by GM, just be warned, as soon as the dealership gets wind that you're going legal, they will clam up and become (even more) unhelpful right away, so cross that bridge carefully.

Because I believed this fault was related to the recall, I opened a TCA case. GM provided dealers with a testing procedure, and the result was that this fault was unrelated to the recall.

However, many GM 6.2 engine lifters are broken. This might not be the same issue as the previously announced recall by GM, but a large number of lifters have broken. If this isn't a previous problem, then this should be a new safety issue.
This issue is not currently a recall, so GM is asking owners to pay for the repairs themselves， several thousand. Therefore, I urge all owners with the same broken lifter to report this problem to the NHTSA. If the number is large enough, they will ask GM to investigate and issue a recall and compensation.

Sounds like a great idea!

I just read through NHTSA 25V274 . This has nothing to do with lifters. I have attached the entire .PDF and have also included this excerpt that describes this safety recall report'* specifics, which include the crankshaft and connecting rods:

Exactly!
The recall only applies to Crankshaft and Rods engines. However, many, many engine lifters are actually broken, which are not currently included in the recall.
If we don't report this to the NHTSA and trigger a new recall, we will all have to pay thousands in repair costs each.
If GM refuses, we should take legal action to protect our rights.
But initially, we should report to the NHTSA immediately.

Apparently GM is in hot water with the NHTSA right now over the 6.2L engines. https://www.carscoops.com/2025/10/gm...-want-answers/
It might be worth it to try to reach out to the NHTSA because according to this article they (NHTSA) is not very happy with GM right now on the engineering and the ineffective fixes for this engine.

Unfortunately, my L87 engine underwent a recall inspection on September 8th, and the only result was a replacement of the existing parts. I had it oil change normally on October 2nd, and then on October 12th, the engine developed a serious malfunction. Despite requesting a TCA case from the dealer, the engine passed the recall test, supposedly due to a broken Lifter and Camshaft, requiring me to pay $5000 out of my pockets for repaired. I picked up the car on October 29th, and on November 8th, the engine stalled again on the freeway. I want to say that GMC is shirking responsibility. Simply changing the oil cannot prevent the malfunction. The faulty parts are definitely not just the Camshaft and Rods; they could cause other parts to fail and ultimately render the entire engine unusable.

These ^^^^^^^ are why I thought you believed that this part failure was covered by NHTSA 25V74 .

So . . . it passed inspection or it had to have replacement parts?

Who changed the oil?

Was the oil full as of this malfunction?

What was the cause of this stall?

Why? Is GM refusing to repair anything?

Are you referring to this?: "Vehicles that pass inspection will be provided a higher viscosity oil, which will also require a new oil fill cap, an oil filter replacement, and an owner’* manual insert."

If so, then I disagree. Increasing the viscosity would help greatly. I don't know why they would have lowered it to 0W20. I have a hard time putting that swill in my friend'* CRV, let alone into a 420HP V-8. At least the CRV has a long history of running on that stuff and lasting a long time. I hear the "higher viscosity oil" is 0W40. That will definitely help.

I agree, although in theory each of these parts' shavings etc. from damage would next go to the pan, then the filter. At the same time, I totally understand where you're coming from on this one. Bad rods can affect the crank and oil pump, and a bad cam can affect the lifters and oil pump.

I am curious: Is your 2023 out of warranty?