Just joined the 2021 Yukon lifter group

[Buco2020]

I purchased a new 2021 Yukon XL Denali in July 2021. At 19k miles, left lifter bank went. Dealer would only replace 8 lifters. I m in retail automotive on the adaptive vehicle side and told the service manager I was calling the tech center to get it approved. He said he can replace the other 8 under a customer satisfaction code. Keep this in mind if you run into the “we are only replacing half” discussion.

Any call to GMC customer service goes against the service department even if they did nothing wrong (according to the service mgr).

 

[OR VietVet]

Welcome to the forum and yes, stand your ground. It never makes sense to replace only 8 lifters.

 

[Tangerine GT]

If they won't do both sides , grab a plug in tuner and delete the dod, it won't fix the GM issue but it will prolong it.
The best way is to do a cam and lifter swap but you will still need a tune

 

[RAMurphy]

Welcome to the forum. Keep pushing - firm believer squeaky wheel gets the grease.

 

[Miami-Dade]

Welcome from Miami!....Moved your thread over here where you belong.

 

[WalleyeMikeIII]

If they won't do both sides , grab a plug in tuner and delete the dod, it won't fix the GM issue but it will prolong it.
The best way is to do a cam and lifter swap but you will still need a tune

This is not known to be possible on the new platform.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[mnemonicmark]

Hello everybody,
Received the news that one lifter (cyl. 3) collapsed and will be replaced — and now the camshaft will be replaced as well since the collapsed/damaged lifter also damaged the cam shaft. (see attached photo)
It's a 2019 Yukon XL Denali, 66000 miles — GMC pre certified with 100k powertrain warranty.
Any suggestions? Thoughts? Things I need to be aware of?
Thanks,
/M

 

[Shrubs2K2]

I purchased a new 2021 Yukon XL Denali in July 2021. At 19k miles, left lifter bank went. Dealer would only replace 8 lifters. I m in retail automotive on the adaptive vehicle side and told the service manager I was calling the tech center to get it approved. He said he can replace the other 8 under a customer satisfaction code. Keep this in mind if you run into the “we are only replacing half” discussion.

Any call to GMC customer service goes against the service department even if they did nothing wrong (according to the service mgr).

Good Luck! I tried everything under the sun to get my other side replaced. I even sent a 4 page letter (conversation log included) to the Executive Support team in Michigan (addressed directly to the GM's North American President - forget the name).

As expected, they did nothing!

 

[DuraYuk]

Hello everybody,
Received the news that one lifter (cyl. 3) collapsed and will be replaced — and now the camshaft will be replaced as well since the collapsed/damaged lifter also damaged the cam shaft. (see attached photo)
It's a 2019 Yukon XL Denali, 66000 miles — GMC pre certified with 100k powertrain warranty.
Any suggestions? Thoughts? Things I need to be aware of?
Thanks,
/M

It's warranty so it's free. It's a pushrod v8 so it's easy to fix.

My suggestion is have them fix it and let it roll.

But do so quietly as your 2019 is supposed to be free from lifter problems as forum members here only brigade the new platform in terms of perceived issues nevermind that the 21+ is largely dead compared to the rest of the generations and their problems.

Good luck. Fix doesn't take long if they have everything they need.

 

[DuraYuk]

Good Luck! I tried everything under the sun to get my other side replaced. I even sent a 4 page letter (conversation log included) to the Executive Support team in Michigan (addressed directly to the GM's North American President - forget the name).

As expected, they did nothing!

That's how warranty work is. They can only replace what's broken. Can't replace things just because.

 

[Shrubs2K2]

That's how warranty work is. They can only replace what's broken. Can't replace things just because.

Known issue with plenty of precedence out there. From my perspective it's not a matter of "if" but "when".

 

[DuraYuk]

Known issue with plenty of precedence out there. From my perspective it's not a matter of "if" but "when".

You could say the same for a lot of things. Doesn't matter. Has to be broke to get fixed under warranty...period.

 

[Shrubs2K2]

Disagree for my vehicle.

 

[mnemonicmark]

Thank you

Shrubs2K2 and DuraYuk.​

The car is still at the shop — 2 weeks now. Good news is that GMC will replace all lifters and the camshaft without cost to me. I was offered to replace the spark plugs while everything is apart to save the labor cost and agreed.

I am attaching another photo of the passive(!!) lifter that is wrecked — it was not the passive active lifter on 3 that failed...

Thank you again for your comments!

/M

 

[Billy Bass]

Ii have a 2021 GMC Yukon SLT with the 5.3 and 10 speed auto. I heard if you put transmission in L9 it stays in V-8 mode.

 

[tom3]

Any time I'm cruising around town I do that too. I don't like feeling those four cylinders lugging when lightly accelerating. I've read that that puts those cylinders at near 100% load. Loading up the engine like that should be for eyeball flattening fun I think.

 

[WalleyeMikeIII]

Any time I'm cruising around town I do that too. I don't like feeling those four cylinders lugging when lightly accelerating. I've read that that puts those cylinders at near 100% load. Loading up the engine like that should be for eyeball flattening fun I think.

Note, in @mnemonicmark’s case he said the passive lifter failed…so in his case, DFM delete would have done nothing…

 

[Geotrash]

Thank you

Shrubs2K2 and DuraYuk.​

The car is still at the shop — 2 weeks now. Good news is that GMC will replace all lifters and the camshaft without cost to me. I was offered to replace the spark plugs while everything is apart to save the labor cost and agreed.

I am attaching another photo of the passive(!!) lifter that is wrecked — it was not the passive active lifter on 3 that failed...

Thank you again for your comments!

/M

Wow! That looks like spalling caused by poor lubrication, to my eye. Did they offer any hypothesis as to why it failed?

 

[pa31p]

You can L9 all you want (as do I to eliminate DFM vibration) but the problematic parts are what they are. L9 won’t solve that.