NHTSA opens preliminary probe into more than 870,000 GM vehicles

[Fless]

https://gmauthority.com/blog/2024/04/some-2023-gmc-sierra-and-yukon-units-will-need-a-6-2l-v8-engine-replacement/

So not really a recall, just a Customer Satisfaction Program.

 

[TheAgency]

Sorry to hear about your vehicle. It sounds like you heard the bottom end problem before it hard failed, unless for some reason the noise if from the High Pressure Fuel Pump. Could alse be the thrust bearing going on the crank?

A few quesitons:
Assume you are the original owner?
What weight oil did you run? 0W20, 5W30 or other?
You indicated you were fussy about fuel quality, explain this please? 89, 91, or 93 Octane and a specific brand?
What is the build month and date on the vehicle?
Since your vehicle is a 2023, do you know if your vehicle fell within the "Oversize Lifter Bore" group? Were you ever notified by GM about this issue?

Please update the thread on what the dealer finds as well.

Just trying to gather more context on these failures.

-I am the original owner. (I am nuts and OCD. I have the entire front end wrapped in PPF, handwash only, no eating in the truck, etc)
-Always 0W-20 per GM Spec
-93 Octane from BP is my preferred source of fuel, from a specific station that I trust. Will settle for Holiday 91 Octane when I have to, as they are all over MN.
-I can't reference the build date at the moment, with the truck at the dealership currently. I ordered it and it was delivered late August 2023.
-I was never notified by GM about any issues.

I'll update again on what the dealer finds.

 

[jfoj]

-I am the original owner. (I am nuts and OCD. I have the entire front end wrapped in PPF, handwash only, no eating in the truck, etc)
-Always 0W-20 per GM Spec
-93 Octane from BP is my preferred source of fuel, from a specific station that I trust. Will settle for Holiday 91 Octane when I have to, as they are all over MN.
-I can't reference the build date at the moment, with the truck at the dealership currently. I ordered it and it was delivered late August 2023.
-I was never notified by GM about any issues.

I'll update again on what the dealer finds.

Thanks for the follow up.

Dealer should be able to confirm if this was in the VIN window of Oversize Lifter Bores. Might make sure they check as I am not 100% sure if they would be automatically flagged.

It seems if the 6.2 gets past 7500 miles, the next danger window seems to be between 25,000-35,000.

What is your approximate percentage of City vs Highway driving?

 

[TheAgency]

Thanks for the follow up.

Dealer should be able to confirm if this was in the VIN window of Oversize Lifter Bores. Might make sure they check as I am not 100% sure if they would be automatically flagged.

It seems if the 6.2 gets past 7500 miles, the next danger window seems to be between 25,000-35,000.

What is your approximate percentage of City vs Highway driving?

I spoke with the dealership today and confirmed that we need a new main bearing and camshaft. Apparently, the shop foreman has been working on it, and the engine block is fine, so they'll proceed with rebuilding the existing engine. All under warranty and no concerns there, and they've been more than great to work with, beginning with putting me a Sierra as a loaner.

He did not see my vehicle in any bulletins.

I do no considerable highway driving, maybe 20%, if we are considering that as hours behind the wheel at a time, at 65-75mph on the interstates. Most of my driving is within the city, 25 miles to the office, 15 to bring my daughter to school, 10 to the golf course, and so on.

Interestingly, I've been doing my own research and it sounds like there was an engine update in mid-late 2023. With an August 2023 delivery of this truck, it could be likely that I had an engine that was produced before that update. This is definitely something I'll be diving into more once I have the truck back. (I also have a 2024 Yukon Denal 6.2 with only a few thousand miles, so my stakes are double!).

I asked them to push GM for some degree of extended bumper-to-bumper warranty, which he thought was reasonable. My fear is that with everything coming apart, does then something like an AC line start to leak later this summer out of warranty.

 

[jfoj]

The Agency, sent you a message.