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I have written in this forum several times about the lifter failures on my 2021 Suburban 6.2L. There were 3 major valve lifter failures in 23K miles. All were repaired by warranty. Nonetheless, as I approached the end of the 5-year warranty, I realized the Sub was unreliable. The dealer was great. Offered me maximum trade for 2021 and cost for 2025 Sub. I did research with the dealer, the dealers’ mechanics, my contacts at GM and experienced independent mechanics. No one could give assurance that the 2025 Sub 6.2L would be any better.
I started looking for something else. I bought a 2025 Hyundai Palisade SEL Premium. It is not the land yacht or powerhouse of the SUB, but it has a strong V6, high tech everything, 2nd row bench, towing package with towing enough for my motorcycle trailer, 100K/10-year bumper-to-bumper warranty, 5-years free service, free car washes at nearby dealer and the purchase was a walk away, my “paid-for-Sub” was an even trade with no money out of my pocket.
Love my Subs. Had three of them since 1994, but GM cannot seem to make a reliable big, high performance, mass market V8. I am sorry to leave the Sub family.
Best to all on the forum.
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The failure is so much worse than the lifters. There is a systemic failure at GM right now where they are ignoring these problems, and have been, since the AFM/DOD system first debuted in 2007.
It is cheaper for GM to replace lifters/motors under warranty than it is for them to fix the problem. My 2011 Silverado LTZ 5.3L grenaded itself at 64k due to the lifter problem, and here we are 14 yrs later, and still seeing the same issue.Every new generation GM doubles down on the AFM/DOD/DFM system, using the same silly lifter design.
And if the lifters done fail, the 10 speed transmission will.
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I had a 2013 Silverado 1500 5.3 no problems at all, a 2014 Corvette 6.2, 7 speed manual, no problems at all.
My 2018 Sierra 6.2 with 8 speed shifted like crap and I sold it at 65,000 miles but no 6.2 problems at all.
My 2023 Silverado 1500 6.2 with 10 speed only has 30,000 on it. No motor issues, but the 10 speed is a whole new
experience. It will downshift when driving 35 – 50 MPH and won’t upshift. On the highway, flat roads towing my boat,
it will downshift motor is running 3400 RPMs, won’t upshift unless I let off the accelerator.
Dealer of course says it is fine, “the 10 speed is just shift happy”. -
My 2022.5 (refreshed) came thru with AFM/DOD delete as it was built during Covid and apparently GM got permission to continue building even though it didn’t have DOD. However my daughters 2018 GMC has eaten 1 set of lifters on the passenger side. No cam damage but I did replace 4 lifters. As it turns out ,once I removed the defective lifter i simply dropped it on the concrete floor and it snapped back into the inflated mode. Would I trust it again–NO – but the new lifters could do the same thing again and fail. WHY will GM not fix this??
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There is no such thing as factory DOD/AFM delete. The vehicles built during the chip shortage dont have the electronic portion that activates the DOD/AFM system. But, you still have the same lifters. So while I agree that probably increases the mileage you’ll get before the lifters fail, the failure is mechanical in nature, and you have all the same mechanical parts.
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