JADMAN416

Grounding was my issue in my wifes 2015 Silverado. Watch the video posted near the beginning of this post. It's very helpful. you can gain descent access to ground studs on both sides by 1) removing a pillar covers 10MM ratchet, 2) removingdash, front pop-in panel only (easy to pop off once a-pillar platic is removed), 3) remove the speakers and now i used an offset wrench to get the ground screws off. (don't drop them!!) Clean up the terminals, trim back the insulation and prob was solved. the pics show the smoking gun. Good Luck!

Problem solved for me after cleaning up these grounds! Good luck guys. Also dont forget to clean both the stud and the terminals!! Access the stud through the speaker opening on both sides of dash.

I had a similar issue with my wife's 2015 Silverado. We checked the items listed in this TSB https://testing-public.carmd.com/Tsb/Download/112155/4318397 I found that the ground under the passenger side dash was the problem. Its super easy to access with a screw driver and a 10MM socket. Once under the dash i accessed the ground studs by removing the tweeters on both sides. In my case I could clearly see that the ground wire had rubber stuck on it and was likely the culprit so don't forget to clean all ground contacts!!! terminals and studs. Problem solved. Good luck with yours if this is your issue.