2022 6.2L Engine Failure

[hclrockwall]

2022 model 6.2L with 20,000 miles in 15 months locked up. No prior issues or warning lights. The dealer is replacing the engine which is good but I want to know why this happened. I am not getting any answers back. I am concerned that any replacement engines will have similar issue. Has anyone else heard of this type problem and what may be the cause? I am concerned their is a defect that has never been caught before.

 

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[hclrockwall]

First, I errantly duplicated my post on this topic. My apologies. However, I have found several articles chronicling the common failures of this engine due to the AFM system that apparently induces failures of valves, pushrods, cranks, etc. Does GMC have this fixed or will this be a continuation with the next engine? I also notice these articles indicating the disabling of the AFM system is a solution. Let me know what y'all think.

 

[Barbersboy]

Sorry that happened to you. I’ve been there. Twice. Finally had enough and switched to diesel.

 

[hclrockwall]

Wonderful. Was the AFM system the route cause of your issue, or do you know?

 

[Barbersboy]

They would not admit it only to say that it has been blamed by many for the failure. Both times for me it was the lifters, rods, and cam. Thankfully both rebuilds were covered under warranty. Over 8k to fix it each time. I had the AFM disabled electronically through a tune but it still failed. The right way to disable it is to have it done with a kit but I was under warranty and was worried if some how it still failed that it wouldn’t be covered.

 

[hclrockwall]

Yep. I just hung up from talking to an independent mechanic about this. He said exactly the same thing. The problem with the AFM is that when the inactive cylinders drop out during a cruise, they are cooler than a running cylinder and when the a sudden demand of power is required from the engine then the cooler rods, springs, valves etc become the problem.

 

[rick25s]

Yep. I just hung up from talking to an independent mechanic about this. He said exactly the same thing. The problem with the AFM is that when the inactive cylinders drop out during a cruise, they are cooler than a running cylinder and when the a sudden demand of power is required from the engine then the cooler rods, springs, valves etc become the problem.

That make more sense than anything else I have ever heard about that problem.

 

[poopster]

That make more sense than anything else I have ever heard about that problem.

Sounds like GMC & GM is having a problem with both the 6.2 and the baby diesel. If I were looking to get a new truck maybe I'd have to look at Ford but are they any better?

 

[Barbersboy]

Sounds like GMC & GM is having a problem with both the 6.2 and the baby diesel. If I were looking to get a new truck maybe I'd have to look at Ford but are they any better?

What issues with the 3.0? Other than the garbage stereo…

 

[poopster]

This here: https://www.at4forum.com/threads/20...esel-check-engine-light-and-exhaust-leak.504/

 

[Barbersboy]

Hmmm. Seems to be most of these posts are prior to the refresh with built in Mexico being a common theme.

 

[rick25s]

Sounds like GMC & GM is having a problem with both the 6.2 and the baby diesel. If I were looking to get a new truck maybe I'd have to look at Ford but are they any better?

Snoop around the f-150 forums. The American truck owners are honest about the problems, unlike the Tundra owners.

 

[poopster]

Hmmm. Seems to be most of these posts are prior to the refresh with built in Mexico being a common theme.

"Built in Mexico" really sucks!

 

[Viking Truck]

They would not admit it only to say that it has been blamed by many for the failure. Both times for me it was the lifters, rods, and cam. Thankfully both rebuilds were covered under warranty. Over 8k to fix it each time. I had the AFM disabled electronically through a tune but it still failed. The right way to disable it is to have it done with a kit but I was under warranty and was worried if some how it still failed that it wouldn’t be covered.

I'm no fan of AFM but if you had it disabled and your engine failed how could that be the cause?

 

[ZZO6]

I'm no fan of AFM but if you had it disabled and your engine failed how could that be the cause?

I beleive the DFM is an outlier more so than the direct cause. I believe it to be more a material failure than an engineering system fault. Maybe even a mix of both. It's really hard to definitely point the finger. That's what's frustrating.