dgravity

Just going through this, myself. I brought home a new to me CPO 2017 Sierra with 27K miles on Wednesday last week. Thursday morning it threw the CEL with codes P300 and P050D. It had a rough idle and hard shifts. I took it back to the GMC dealer I got it from and they are replacing the bank 1 injectors. All covered by warranty. If it hadn't been covered, I would have had some words with the dealership as getting 14 trouble free hours out of a truck this young would have been a "problem" for me. I pick it up tonight. Keeping my fingers crossed that this issue is behind me. I also got the reduced engine power message.

I have had the same issues (touch screen changes randomly from the radio screen and would randomly put calls on hold as well as the DIC switching to the audio display) in my 2015 Sierra SLE that I bought in October. Infuriating! After reading this and other postings on the internet I took the plunge and bought a used touch screen on eBay for $160 and installed it. It has yet to do it again after 8 hours of driving (knock on wood). With the old screen it would start flipping about within 15 minutes or less of starting. I am cautiously calling it fixed. My old touch screen was not very sensitive and required a lot of force and multiple taps to get it to respond. The new screen is a lot better in this regard as well.