Dale Huhtala

I'm researching this issue with my 2017 Sierra SLT too...they have never come on. It is -25, so I'm pretty sure it's cold enough but this has never worked since I bought this truck used. Anybody ever find a solution?

I'm having similar issues. I have a 2017 GMC Sierra SLT with 99,000 KM on it. The lifters/push-rods have failed twice in the last year. $5,800 for the first repair and the second was covered under the one year warranty. They told me the parts they put in for the first repair had to be replaced again but when I looked at the details, the push-rods failed in different cylinders...so not the same parts. This is clearly the AFM issue but here in Canada, there is no class-action lawsuit happening that I know of. I'm looking at doing this repair annually and GMC Canada won't do a thing for me - they called me and read like a robot from a script telling me there were no warranties available. I am considering a 4 year extended warranty that will cost $4,400...what are my other options? Buying another truck is NOT an option because ALL the GM trucks have this issue - still today. I don't see a way out of this. I may not be a GM guy any longer...

I have a 2017 6.2L Sierra SLT - yes, it has lifter issues. I just spent $6,000 on replacing two lifters and push rods, which I believe is due to the AFM issue. I have 90,000 KM on it.

I realize this is an old thread but for those buying used 2017 like me, the big, big difference is the max tow package, as mentioned above. It is a bit of a unicorn but if you see a 2017 or 2018 with the 2500 towing mirrors, it probably has the max tow package. That puts towing capacity at 11,700 pounds on a crew cab 4wd while the Denali cannot be configured above 9,100 pounds. So that made ALL the difference for me. It meant I didn't have to buy the used 2500 for $20K more...and get the jolting ride of a 3/4 ton. Pulling a 7,000 pound trailer (dry weight) means the Denali wouldn't cut it once I was loaded up.