6.2 failure

[Snakeboyaz]

Hi everyone,
My wife’s 2021 Yukon Denali died as she was pulling into a parking lot last night. Same story that’s been posted several times, everything seems fine then It just shuts off and won’t turn over and the starter just clicks. I put a 3ft breaker bar on the crank bolt this morning and it took all I had to budge it so I’m assuming it a spun main. Question is though it’s at 67,000 miles but it seems like they always fail early on, am I just unlucky enough for it to survive just past warranty?
Anyone had to pay out of pocket for a new engine? Curious what the cost might be.

 

[Silverado4x4]

Hi everyone,
My wife’s 2021 Yukon Denali died as she was pulling into a parking lot last night. Same story that’s been posted several times, everything seems fine then It just shuts off and won’t turn over and the starter just clicks. I put a 3ft breaker bar on the crank bolt this morning and it took all I had to budge it so I’m assuming it a spun main. Question is though it’s at 67,000 miles but it seems like they always fail early on, am I just unlucky enough for it to survive just past warranty?
Anyone had to pay out of pocket for a new engine? Curious what the cost might be.

Did you pull the plugs before trying to turn it over by hand? It would take at of force with the plugs in during the compression strokes on a 6.2. Drain the oil and see if you have metal fragments in the oil.

 

[Doubeleive]

Did you pull the plugs before trying to turn it over by hand? It would take at of force with the plugs in during the compression strokes on a 6.2. Drain the oil and see if you have metal fragments in the oil.

i can turn mine with a socket wrench, it's not hard at all, pretty much has to be done to change the ac belt

 

[Snakeboyaz]

Haven’t pulled the plugs, I changed the idler pulley and belt last year and used the same breaker bar to turn the crank to get the belt on and it was no where near as difficult to turn. I am going to drain the oil tomorrow and see how it looks. Dealer said 10k to replace but Gm might cover some.

 

[Geotrash]

Haven’t pulled the plugs, I changed the idler pulley and belt last year and used the same breaker bar to turn the crank to get the belt on and it was no where near as difficult to turn. I am going to drain the oil tomorrow and see how it looks. Dealer said 10k to replace but Gm might cover some.

Fingers crossed. Sad that GM is having some failures with the 6.2 - so many apparently that some people were waiting months for replacement engines. It's such a sweet engine in every other way that matters for driving pleasure. I hope you get some help from GM and can get it resolved in a way that's satisfactory for you.

 

[Jocko PDX]

Haven’t pulled the plugs, I changed the idler pulley and belt last year and used the same breaker bar to turn the crank to get the belt on and it was no where near as difficult to turn. I am going to drain the oil tomorrow and see how it looks. Dealer said 10k to replace but Gm might cover some.

Yikes. This is scary.. what is the time frame/mileage cap on the engine warranty?

 

[B-train]

GM went to the 5yr 60k powertrain warranty on passenger vehicles somewhere around 2015(?) I believe. I was shocked to see the change, but now over time see why. Their cost cutting and CAFE requirements makes stuff less durable, so pass the cost on.......

Fleet sales still have 5yr 100k warranty. But, they are better built in my opinion - less weird gadgets incorporated to squeak out every last mpg for ratings.

 

[DuraYuk]

GM went to the 5yr 60k powertrain warranty on passenger vehicles somewhere around 2015(?) I believe. I was shocked to see the change, but now over time see why. Their cost cutting and CAFE requirements makes stuff less durable, so pass the cost on.......

Fleet sales still have 5yr 100k warranty. But, they are better built in my opinion - less weird gadgets incorporated to squeak out every last mpg for ratings.

The duramax 3.0 has 100k warranty. Guess Cafe and less durability don't apply to it? Or wierd gadgets to squeeze out every last mpg for ratings ?

Also the initial 100k warranty wasn't the norm either. They did that to increase demand. Experiment didn't work. Old gm prior didn't have the long warranty either or the Cafe conspiracy issues you outline.

https://gmauthority.com/blog/2015/03/general-motors-to-trim-100000-mile-powertrain-warranty-to-60000-miles/

As for OP bad luck happens with everything. There's a guy with a camry broke down somewhere right now saying 'I thought toyotas don't break down'

Sorry man. Wish you the best.

 

[Snakeboyaz]

Been playing around with it some more as the dealer can’t get it in anyways. I pulled the starter loose and it still only click once when you try to start it. Battery voltage was down to 6.5 volts per my multimeter after having had the charger on it all night a few days ago, put the charger back on it last night and it showed 12.8v this morning but still only a single click. Motor still seems a lot harder to turn than I remember but the starter is for sure not working.

 

[strutaeng]

I was going to say, I don't think the required tests have been performed yet to condemn the engine as bad.

The fact that it died and doesn't crank is not enough to say much.

Bearings usually don't go bad all-of-the-sudden; rather, they start failing over time if they receive required lubrication. Unless it was oil starved for an extended period of time, which does not sound to be the case. And you'd likely start hearing knocking or rattling noises.

If you can't get an replacement engine from GM, there's still the option to rebuild yours. Again, not knowing what actually happened to it. Unless a rod broke and put a hole on the block or something along those lines...but that would be obvious.

Keep us posted on what you discover.

 

[Snakeboyaz]

Yeah I need to dig into it further for sure. I’ve always done all my own work from general maintenance to rebuilding the 5.3 in our 07 Tahoe and building a 408 stroker we put in my father in laws 06 Chevy. I didn’t want to have to work on a daily driver anymore which is why I bought this car so I didn’t have to worry about anything.

 

[Stbentoak]

No drivetrain warranty?

 

[Geotrash]

No drivetrain warranty?

He's at 67K. Factory powertrain warranty stops at 60K unless it's CPO or has a private extended warranty on it, which I assume he's already thought through. He mentioned above he's hoping that GM will work with him on it but doesn't know yet.

 

[Stbentoak]

He's at 67K. Factory powertrain warranty stops at 60K unless it's CPO or has a private extended warranty on it, which I assume he's already thought through. He mentioned above he's hoping that GM will work with him on it but doesn't know yet.

Sorry, On the LM2 it's a 100K warranty so I kinda thought this one was too. With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

 

[Fless]

With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

Yet here we are.

 

[Geotrash]

Sorry, On the LM2 it's a 100K warranty so I kinda thought this one was too. With proper care, there is no reason under the sun that a long time produced V8 should ever need to be replaced at 67k miles.

100% agree, so it begs the question if anyone yet knows the root cause of the recent failures.

 

[StephenPT]

From what I’ve read, it’s out of spec bearing clearances.

Here’s what I found from a GM Tech.

When I was at Chevy, we found a lot of the 6.2 bearing clearances were well out of spec. Pump provides the flow, bearing provides the pressure — excessive bearing clearance… oil pressure drops and the downstream bearings get starved.

Usually see excessive clearance in 1-3 and spun bearing / catastrophic damage 4-8.

At one point we had 3 new Escalades in the shop for spun bearings / rod knock or failed lifters, each below their recommended interval for first oil change.

 

[WalleyeMikeIII]

Sounds like there may have been a bad batch of bearings at some point in the production cycle.

 

[Geotrash]

From what I’ve read, it’s out of spec bearing clearances.

Here’s what I found from a GM Tech.

When I was at Chevy, we found a lot of the 6.2 bearing clearances were well out of spec. Pump provides the flow, bearing provides the pressure — excessive bearing clearance… oil pressure drops and the downstream bearings get starved.

Usually see excessive clearance in 1-3 and spun bearing / catastrophic damage 4-8.

At one point we had 3 new Escalades in the shop for spun bearings / rod knock or failed lifters, each below their recommended interval for first oil change.

Hmmm… I wonder if the newer variable displacement oil pumps are a contributing factor. Seems to be happening to folks when they’re on the highway at higher RPMs.

 

[WalleyeMikeIII]

Hmmm… I wonder if the newer variable displacement oil pumps are a contributing factor. Seems to be happening to folks when they’re on the highway at higher RPMs.

Not convinced being on the highway means “higher RPM.” My Denali sits around 1200-1400 when cruising on the highway at 65MPH.