Misfire in cylinder #7, 2021 Sierra SLT

[sgtlja]

My 2021 GMC Sierra SLT with 3300 miles on it is in the repair shop (Brustolon GMC Buick) where they are preparing to tear off the top of the engine to replace all lifters, push rods etc. I made contact with GMC customer service and was issued a case number and that's the last I heard from them.

This is my second GMC Sierra, the first was a 2019 SLT which had problems with the transmission from just about day one and they never rectified that problem. All they ever did was flush the tranny and nothing else.

My confidence in GMC is zero right now.

 

[sgtlja]

Do any GMC advisors ever monitor the forum? I am concerned what this repair is going to do to the value of the truck with only 3300 miles on it?

 

[coprj]

mine had the same miss fire issue and the ended up replacing the trucks computer.

 

[coprj]

also check and see if you have a trans shutter while the dmf system is working around 43 mph and 900 rpms. its from turning of cylinders.