Hello everyone let’s just say I had a very long night and very disturbing and upsetting one to say the least. I was taking my family down for kids under the age of 10 and my wife to see her father or grandfather rather and we broke down before we got there. The car was running beautifully OK it’s a 2021 high country suburban 6.2 L never had any issues before with 22,000 miles on it. All of a sudden out of nowhere I start to feel a little thump or jerk and then it continued to get worse followed by multi system failure Alerts traction control ECS the whole 9 yards. I had to have it towed to a local shop today and I am in limbo for right now. Based on the sudden onset of the jerking sensation which was very subtle at first almost like a feeling you get when you ride over expansion joints on a bridge or overpass, and then it got progressively worse following that as I said it started giving me error and ECS failure,traction control failure etc. I run odb2 diagnostics and it was multiple misfires and one was “permanent” etc and they would not go away, it also started smoking at least from one of the exhaust if not both . Any insight on this would be greatly appreciated. It definitely sounds like it’s a lifter issue I’m pretty mechanically inclined and this is an absolute first for me especially after spending $90,000 plus on a car very disappointing.
FYI I am using voice text so I apologize for any grammar or fragment sentences