Main Bearing Failure with 6.2L at 3,200 miles

[ChrisYukon]

"the cam was moving so much that the cam was hitting the timing cover." That doesn't even make any sense.

 

[Dilligaf34]

Reluctor on the cam gear hitting the timing cover.

 

[BacDoc]

So sorry to hear about this! Sounds like you have been out of your truck for over a month?

Some people complain about the price of these new trucks and I always thought they were expensive but worth it - at least if they are reliable! Paying $75k+ you should expect to be taken care of in these situations! If your truck is under warranty and needs an engine it’s reasonable to ask for comparable loaner or at very least rental reimbursement.

Isn’t there a class action lawsuit against GM over this? Seems pretty reasonable to assign responsibility!

 

[Dilligaf34]

Been without the truck for two and a half months. Just got the call that it now needs another motor. The service manager is going to call me after he talks to the area Rep for Gm to find a resolution for the situation. There are six vehicles there now waiting on motors.

 

[Antonm]

The GM LS engines of the early 2000's had close the same HP and never failed, what the hell did GM do, forget how to build engines?
...

 

[Marky Dissod]

GM Gen3 LS V8s of the early 2000's had close the same HP and never failed.
What the hell did GM do, forget how to build engines?

Normally, I assume stupidity before malice. However ...

Engine Half@$$ required dual-mode lifters, which (I suspect) were intentionally designed to be less robust / durable than simple lifters.
Engine Half@$$ is directly responsible for a downturn in Gen4 LS V8 longevity, compared to Gen3.
Besides lifter failure, consider the increased oil consumption from sticky piston rings.

Although Cylinder Confusion mostly did away with the oil consumption / sticky rings,
the dual mode lifters' durability / longevity / reliability has not been improved in TWENTY GOTTDAMNT YEARS.
Leaving not-quite-well-enough alone, for a multibillion dollar multinational automaker,
is INTENTIONAL.

 

[Blackcar]

I don't know what they are doing to cause these failures on 6.2 but I have seen this happen in the 2000s engines with piston slap which started getting to be problem when they stopped fitting pistons to bores in engine and just put engine together without fitting them and you might receive engine that would have piston slap which I have in my 2002 Yukon to this day.

I have seen this happen with 5spd manual transmission the first build series would have bearings on shafts and metal sleeves on bushings and then start replacing sleeves and parts with plastic and parts that weren't as robust to lower cost s of making each new generation of transmission.

 

[BacDoc]

Been without the truck for two and a half months. Just got the call that it now needs another motor. The service manager is going to call me after he talks to the area Rep for Gm to find a resolution for the situation. There are six vehicles there now waiting on motors.

If that’s not enough to enforce the lemon law I don’t know what is! Im not sure what I would do in this situation but being with out your new truck for 2 months is unacceptable. Maybe you should go up as high In GM as you can and tell them you would love to blast social media with positive things about GM if they would just replace your truck with a new one! Much better for their reputation than telling how GM screws over customers who have legit warranty claims.

 

[Dilligaf34]

This is a big inconvenience and also unacceptable, GM customer service has been no help just a bunch friendly patronizing with very little info. When this first started I said I wasn't in a big hurry, I just want the issue fixed right the first time. From what I can tell GM has done very little to address the issues with the 6.2, from what I can tell this is a common problem in years 22,23,24 and continues to grow. It seams like it might be time to start making some noise on social media to get someone's attention. If there is a class action lawsuit ongoing I would like to get involved.

 

[DocDoug]

Update: Parts arrived, they replaced the motor and were trying to put some miles on it and check everything over and the starter started acting up. Ordered a starter and now it is on backorder.

This is why I installed a start / stop harness to avoid the unnecessary abuse of the starter.

 

[DocDoug]

The GM LS engines of the early 2000's had close the same HP and never failed, what the hell did GM do, forget how to build engines?
...

Did they require premium fuel in those days? I bet people running 87 octane in the newer 6.2 is not helping matters. This is why I chose the 5.3 for my Tahoe and haven’t looked back.

 

[Srittle001]

Add me to to the list with people with 6.2 engine problems. Driving down the highway with 47,000 miles on my 2022 Yukon Denali and the car automatically shifts in the neutral and essentially shuts off and says not safe to shift.

I had it towed to the dealer, but only after three hours on the side of the highway because the first tow truck came and told me they couldn’t tow me because the car was not able to shift into neutral. Because of this you need a wheel lift and dolly tow truck, which was not as readily available.

Dealer was able to give me a loaner car, but I am still waiting to hear what the problem is. Should know soon what the issue is but dealer suspects it’s a spun bearing, which would require a brand new engine. They have told me that the engines have recently been available and takes 2 to 3 days to install.

Hoping to get my car back soon and hoping to be able to get extended warranty for free.

 

[Marky Dissod]

Add me to to the list with people with 6.2L engine problems.
Driving down the highway with 47,000 miles on my 2022 Yukon Denali,
and the car automatically shifts into neutral and essentially shuts off and says not safe to shift.

How is a transmission problem, an engine problem?

 

[Antonm]

How is a transmission problem, an engine problem?

When the computer sees vehicle speed but no engine speed it shifts the transmission to neutral, its kinda a safety feature, (like how the transmission won't go into park at speed type thing). So if the engine seized from a main bearing failure while driving at highway speeds, the transmission going to neutral is something that would happen.

What I don't get is of the people that have had this happen, all have said they didn't hear or feel anything abnormal first. Like is everyone rocking out with the radio at full blast or is an engine seizure a more quiet event now than is used to be?
...

 

[Srittle001]

When the computer sees vehicle speed but no engine speed it shifts the transmission to neutral, its kinda a safety feature, (like how the transmission won't go into park at speed type thing). So if the engine seized from a main bearing failure while driving at highway speeds, the transmission going to neutral is something that would happen.

What I don't get is of the people that have had this happen, all have said they didn't hear or feel anything abnormal first. Like is everyone rocking out with the radio at full blast or is an engine seizure a more quiet event now than is used to be?
...

Oh mine started rattling and making a very loud noise and I instantly knew it wasn’t normal. I immediately pulled off the road and googled the nearest dealership and saw it was 6 miles away. Immediately headed to the dealer and 1 mile before the exit my car went into neutral and unfortunately ended up 1/2 mile short of the dealer on the side of the highway.

So went from no noise to instant problem and didn’t make it 6 miles before the car shutdown.

Dealer confirmed spun bearing rod and waiting on GMC to authorize how they want to fix this issue.

 

[Polo08816]

New update, they replaced the starter and fuse box. Picked it up late Friday 5/10, over the weekend it lost throttle for a split second or 2 several times, stalled a few times and than the engine light came on(BTW, I put 110 miles on it). Took it back Mon. 5/13 they checked it out and said it was losing the reading on the reluctor for the cam. Gm advised them to do a further tear down, there they found that the cam was moving so much that the reluctor on the cam gear was hitting the timing cover. They are now waiting for GM to tell them how to move forward. They currently have 5 trucks that need new motors and 2 other trucks that have had new motors fail. GM WHAT A F**KING SH*T SHOW.

That engine is done.

 

[BlaineBug]

Maybe they'll be nice enough to replace that horrible gas guzzler for you with a tip-top of the line electric Tahoe!

 

[Polo08816]

No need to tell what the part number WAS ... but, what's the NEW part number?

Part# 12740076

Hopefully this resolves all the issues ... probably wishful thinking.

 

[Srittle001]

Oh mine started rattling and making a very loud noise and I instantly knew it wasn’t normal. I immediately pulled off the road and googled the nearest dealership and saw it was 6 miles away. Immediately headed to the dealer and 1 mile before the exit my car went into neutral and unfortunately ended up 1/2 mile short of the dealer on the side of the highway.

So went from no noise to instant problem and didn’t make it 6 miles before the car shutdown.

Dealer confirmed spun bearing rod and waiting on GMC to authorize how they want to fix this issue.

Update: Dealer notified me that they will be installing a new engine. Engine should arrive in 2 days and 2-3 day install.

 

[Antonm]

Update: Dealer notified me that they will be installing a new engine. Engine should arrive in 2 days and 2-3 day install.

You managed to get 47K miles on the engine before it spun a bearing. Care to share what oil weight/ brand and what oil change interval you were using before the old engine went south?
...