New bulletin/Campaign 6.2 L87

[newdude]

Lastest revisions.  

 

N252494000 - This is the one with the oil viscosity switch OR new engine replacement if the existing one tests bad.  The procedure for engine diagnosis has been added.  If P0016 is set, put an engine in it.  If P0016 is NOT set, test the engine with Picoscope and special adapter.  If it PASSES the test, 0w40 oil and the extended warranty take effect.  If it FAILS, new engine and 0W20 for the new engine.  

 

IT IS A PHASED ROLLOUT.  Not every truck will show this recall active right away.  

 

N252494000-01 Bulletin.pdf

 

N252494000-01 FAQ's.pdf

Edited May 15, 2025 by newdude

[KARNUT]

42 minutes ago, WeGone said:

 Wow this what I fear. For those that say just go on that 6K plus mile road trip and let it die... I'm 70 and don't want to deal with that kind of issue, thought this would be my last truck and I would enjoy it trouble free for at least 15 years. Hell my 2000 GMC may only have 134K and never had any issues never let me down, I trust it more than the 2021. I have owned over 30 GM vehicles  and this may well be my last GM truck !

I was used to buying a new ride every two-three years. My 2014 GMC was my first retirement vehicle. The cylinder deactivation spooked me. Then came the Hyundai Santa Fe. I had two instances of reduced power when passing, scary. No check engine light. So they didn’t fix. Then a 2017 Camry. My grandaughter needed a car so at 60k miles she got it. It was boring I was looking at an excuse. At the same time my mother in law quit driving and gave us a 2015 CRV. After 2 years I traded my daughter for a high mileage odyssey. At the same time I had an old avalanche and my wife’s Genesis was getting up there in years. Still I’m test driving new cars. The costs and let’s face it. With the nannies they are not enjoyable to drive. It seems they’re all ticking time bombs. I rather have a couple of used certain models and do heavy maintenance. I’ll even replace an engine if needed and rotate. If I really feel the need for a new one I’ll lease. My local Honda dealership is certifying some of their vehicles with 100K miles on them. I don’t see an overly complicated unreliable new vehicle in my future. Walmart sells new car spray. I’m good.

[WeGone]

 KARNUT. Agree I have been restoring Corvette's for 45 years, many with well over 100-200k miles. my wife's 2011 Honda has no issues 200k and still on the original clutch. 

[MrLeadFoot]

2 hours ago, newdude said:

Lastest revisions.  

 

N252494000 - This is the one with the oil viscosity switch OR new engine replacement if the existing one tests bad.  The procedure for engine diagnosis has been added.  If P0016 is set, put an engine in it.  If P0016 is NOT set, test the engine with Picoscope and special adapter.  If it PASSES the test, 0w40 oil and the extended warranty take effect.  If it FAILS, new engine and 0W20 for the new engine.  

 

IT IS A PHASED ROLLOUT.  Not every truck will show this recall active right away.  

 

N252494000-01 Bulletin.pdf 1.49 MB · 4 downloads

 

N252494000-01 FAQ's.pdf 142.77 kB · 3 downloads

OK,now they are making a LITTLE more sense using the Pico, instead of just looking to see if something already spun via the p0016. 

[MrLeadFoot]

2 hours ago, newdude said:

If it PASSES the test, 0w40 oil and the extended warranty take effect.  If it FAILS, new engine and 0W20 for the new engine.  

I don't see in the bulletin where it says this part. 

[newdude]

6 minutes ago, MrLeadFoot said:

I don't see in the bulletin where it says this part. 

 

 

"Dealers will inspect and, as necessary, replace the engine. 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’s manual insert."

 

"FOR ENGINES THAT PASS ONLY: Perform an oil change to 0W-40 Oil. Install a NEW engine oil cap and place the owner’s manual insert(s) in the glovebox."

 

I might be premature on the warranty part but going off of other sources, the extended warranty will kick in on engines that are PASSED.  GM 6.2L V8 L87 Recall and Warranty Extension: What California Owners Need to Know About Their Legal Rights — Valero Law - California Lemon Law Attorney

 

Replacement engines will still use 0W20.  Both oils are listed on the parts listing in N252494000.  

[MrLeadFoot]

1 hour ago, newdude said:

I might be premature on the warranty part but going off of other sources, the extended warranty will kick in on engines that are PASSED.  GM 6.2L V8 L87 Recall and Warranty Extension: What California Owners Need to Know About Their Legal Rights — Valero Law - California Lemon Law Attorney

I know, there has been so much in the media about this, but I don't recall ever seeing something from GM itself about an extended warranty, so I am going to remain doubtful about that part. By me staying doubtful, if they do end up doing an extended warranty, I will end up feeling better than if I expect one but they don't provide it.

 

Also, all the stuff in the media word it as GM "offering" not "providing" the extended warranty. Two completely different meanings!

Edited May 15, 2025 by MrLeadFoot

[PunchT37]

Defective cranks or not, put at least 5w30 in these things[should have from the beginning], and watch at least 3/4 of these bearing problems not happen.

[Byrds8]

Too bad the updated recall doesnt mention extending the warranty.

[177mph]

I have a 2024 Sierra Denali with the 6.2 motor.  The latest TSB says that certain serial number motors are affected and certain ones are not.  They say the dealer needs to check the engines serial number to confirm when it was built.  The TSB says that the engine serial number is on the back of the left side cylinder head -and can be seen from underneath.  I just crawled under there and looked EVERYWHERE.  No serial number.  Where else can it be found??  (Keep in mind this is NOT the VIN)

[177mph]

This is the language in the latest TSB:   

 

• Looking upwards from under the vehicle towards the rear of the Left Hand cylinder head,
inspect the digits indicated on the sticker above to determine the build date of the engine. The
first two digits circled are the build year (‘24 in this example), and the next three digits are the
build day (day 114 in this example). If the engine was built BEFORE 24183, proceed to step
2.
• If the engine was built on or AFTER 24183 no further action is required. Submit labor
operation 9107922.
 

[newdude]

13 minutes ago, 177mph said:

I have a 2024 Sierra Denali with the 6.2 motor.  The latest TSB says that certain serial number motors are affected and certain ones are not.  They say the dealer needs to check the engines serial number to confirm when it was built.  The TSB says that the engine serial number is on the back of the left side cylinder head -and can be seen from underneath.  I just crawled under there and looked EVERYWHERE.  No serial number.  Where else can it be found??  (Keep in mind this is NOT the VIN)

 

3 minutes ago, 177mph said:

This is the language in the latest TSB:   

 

• Looking upwards from under the vehicle towards the rear of the Left Hand cylinder head,
inspect the digits indicated on the sticker above to determine the build date of the engine. The
first two digits circled are the build year (‘24 in this example), and the next three digits are the
build day (day 114 in this example). If the engine was built BEFORE 24183, proceed to step
2.
• If the engine was built on or AFTER 24183 no further action is required. Submit labor
operation 9107922.
 

 

 

There was/is 3 different recall numbers.  Can't just say "the latest TSB" and not reference which one it is as these are all attached specific to VINs which recall it falls under.  

 

N252494002 is the one you are referring to but VINs will no longer transfer from N252494000 to N252494002.  N252494002 is put an engine in it or if it had one already replaced, replace that one.  N252494000 is the inspect for DTC and if the P0016 is present replace, if not test the engine and see from there to 0w40 it or replace it.  

[177mph]

1 hour ago, newdude said:

 

 

 

There was/is 3 different recall numbers.  Can't just say "the latest TSB" and not reference which one it is as these are all attached specific to VINs which recall it falls under.  

 

N252494002 is the one you are referring to but VINs will no longer transfer from N252494000 to N252494002.  N252494002 is put an engine in it or if it had one already replaced, replace that one.  N252494000 is the inspect for DTC and if the P0016 is present replace, if not test the engine and see from there to 0w40 it or replace it.  

Thats fine.  I assumed the TSB's came out in order but perhaps they dont.  Back to the question.  Where do I find the engine serial number?

[WeGone]

20 minutes ago, 177mph said:

Thats fine.  I assumed the TSB's came out in order but perhaps they dont.  Back to the question.  Where do I find the engine serial number?

This is what it looks like drivers side rear of head.

[newdude]

3 hours ago, 177mph said:

Thats fine.  I assumed the TSB's came out in order but perhaps they dont.  Back to the question.  Where do I find the engine serial number?

 

 

Recalls.  Not TSBs.  There was 3 different ones launched but one of them was more or less for staging purposes.

 

Serial # is where they say it is and like what @WeGone posted.