6.2 L Recall

[Tom73]

Just saw that there is a recall on the 6.2L L87 engine in the trucks 2021-2024. Lower end issues, connecting rods/crankshaft. 

https://gmauthority.com/blog/2025/04...of-propulsion/

 

First a transmission and now possibly a new engine 

Edited April 27, 2025 by Tom73

[Bikerjon]

1 hour ago, Tom73 said:

Just saw that there is a recall on the 6.2L L87 engine in the trucks 2021-2024. Lower end issues, connecting rods/crankshaft. 

https://gmauthority.com/blog/2025/04...of-propulsion/

 

First a transmission and now possibly a new engine 

Yeah unspecified manufacturing defects. Time to start telling us the truth.

[Tom73]

2 hours ago, Bikerjon said:

Yeah unspecified manufacturing defects. Time to start telling us the truth.

I’m thinking main bearings since they reference connecting rods and crankshafts. Wonder what the inspection will be, drop the pan to check or ?? Maybe they just look for rods sticking through the block?

[Tom73]

Saw my dealer today. They don’t know anymore than I do. Computer says parts are not yet available. No idea what parts they referencing. They do not know what is to be inspected let alone how in-depth it would be. Right now just a wait and see.

 

 

[Tom73]

 

 GMAuthorty asked why 2025 models were not included in the recall. Here is what they were told:

We asked General Motors, and here’s what they told us: “A series of crankshaft and connecting rod manufacturing improvements implemented on or before June 1st, 2024, addressed contamination and quality issues. Model-year 2025 vehicles were built after these improvements and are not included in the recall.”

https://gmauthority.com/blog/2025/04...year-vehicles/

[Bikerjon]

23 hours ago, Tom73 said:

 

 GMAuthorty asked why 2025 models were not included in the recall. Here is what they were told:

We asked General Motors, and here’s what they told us: “A series of crankshaft and connecting rod manufacturing improvements implemented on or before June 1st, 2024, addressed contamination and quality issues. Model-year 2025 vehicles were built after these improvements and are not included in the recall.”

https://gmauthority.com/blog/2025/04...year-vehicles/

I hope that is true. Not getting much honest info out of GM about the 6.2 engine or the 10 speed transmission.

[66ss3964spd]

16 hours ago, Bikerjon said:

Not getting much honest info out of GM about the 6.2 engine or the 10 speed transmission.

Damage control.

[BIGDOGx]

On 4/27/2025 at 11:45 PM, Tom73 said:

I’m thinking main bearings since they reference connecting rods and crankshafts. Wonder what the inspection will be, drop the pan to check or ?? Maybe they just look for rods sticking through the block?

This was posted on GMI about this issue..

 

Quote

The inspection only consists of looking for a DTC P0016 trouble code in the computer nothing more.

No way GM is going to rip apart the bottom end to check this the correct way. Most will be given the oil change and new fill cap and they will hope the thicker viscosity pushes this issue past their warranty obligations. If i owned one of these trucks i would bite the bullet and send off an oil sample to get tested.

[newdude]

Just sharing this, the 9 page and counting discussion going on for this - 

 

[Tom73]

GMAuthority has published more on the recall. It covers GM vehicles with the L87 6.2L engines produced between March 1, 2021 to May 31, 2024. Total of 597,630 vehicles in the US. 
Here is the breakdown:

 

[Tom73]

More from GM Authorty

GM estimates that only three percent of recalled vehicles have a defective engine, or roughly 18,000 units of the 597,630 units recalled in the U.S.

https://gmauthority.com/blog/2025/05/gm-6-2l-l87-engine-recall-it-took-14k-people-to-complain-for-it-to-happen/

[66ss3964spd]

I'm curious how GM is determining the 3%.

 

Aside from obvious audible and visual signs; knocking or a rod sticking out of the side of the block, the "inspection" is limited to scanning for P0016. If P0016 exists in the ECU the engine gets replaced. If P0016 is not present the engine gets 0-40 oil as a precautionary measure.

 

The precaution suggests, to me, that GM does not have full confidence that the lack of P0016 is proof that there is no defect.

 

Further, since P0016 indicates an unanticipated timing mismatch between the crank and the cam, but the reported defect has to do with the rod and/or main bearings, how do failing rod/main bearing cause a timing mismatch since the cam is driven off the front of the crank with a chain. Since issues with the rod/main bearing can effect oil pressure, and the VVT system relies on oil pressure to work, perhaps that's the tie in.

[Tom73]

I don’t see where P0016 would be involved. It is just the alignment/timing between the crankshaft and the camshaft. This recall is the crankshaft journals and bearings. 
 

The P0016 code indicates a problem with the correlation between the camshaft and crankshaft positions in your GM vehicle, meaning they are not in sync. Common causes include a damaged timing chain or belt, faulty sensors, or issues with the variable valve timing system.

Edited May 2, 2025 by Tom73

[66ss3964spd]

See attached -001 recall notice. Page 2, "Service Procedure", #1.

N252494001 Bulletin (2).pdf

[Tom73]

Good reading. But don’t see how the camshaft position can be affected by the crankshaft bearings. Unless the bearings are so bad the crankshaft is moving around in the main journals.