I have a 2014 GMC Sierra 1500 which I bought in April 2015 as a certified pre-owned (15,000 miles) At 40,000 miles it began throwing misfire codes and the dealer ended up replacing all the injectors. Recently at 60,000 miles, the check engine light began to flash and the traction control error light came on. Took it to a local shop which diagnosed the #1 cylinder has over 32,000 misfires and the piston had a hole in it. They confirmed I had not broken a valve or spring.
Come to find out, I was 3 months past the 5 year power train warranty. GM is offering some assistance with the repair, which will be a new motor. I'm still going out about $4,500 and the dealer can't tell me why the motor had the failure.
I suspect this has been a problem with these motors, because everyone I have spoken to does not seem surprised. Anyone else have this type of problem? Any thoughts of what could have caused the motor to fail?
