Leslie Politron

Sorry for the late response. Still having issues with random CEL blinking after misfires. I’m at 7,250 miles now. It always happens when driving under 30 mph. 3 times this week already. I set up an appointment at the dealer for tomorrow and they just called and said “gm is aware and sent us word to hold off on any repairing or replacing of parts & they won’t fix or replace anything on my truck, basically they will clear the error codes and send me on my way until gm tells them what to do. She said it’s happening with a lot of Sierra/Silverados right now. I’m honestly losing my patience already. I have so many mods planned out and put on the back burner because I don’t feel comfortable doing them until all of this gets sorted out. Wondering if I just throw in the towel and switch to a different brand truck

Manifold Absolute Pressure sensor

Hi. I bought a new 2021 AT4 March 5. 20 miles on it. Drove home from the dealer (4 miles) and the next time I turned it on, CEL and OnStar diagnostics emails me to take it to the service department. They say they reset MAP sensor and send me on my way. Later that day, same thing happens. I take it back in, they say MAP sensory needs replacing. They had it almost 2 weeks waiting on the part. After they replaced it, everything went fine for about 1200 miles and then I get blinking CEL for about 30 seconds then it stops. Next day, blinking CEL for a minute or so, and then it turns solid. I took it back to the dealer and they say the only code pulled was P0300 misfire. They have no idea what’s causing it, and quite frankly I’m pretty fed up at this point. They’ve had my new truck longer than I have in the month I’ve owned it. Has anyone had something similar happen?