ClicksNGlitches

Pull your Passenger compartment fuse panel cover. use a meter and test each meter (in place) and make sure all 3 connectors are firmly connected. I just got this problem and thats how I found this thread on my 2021 Sierra. I had recently removed the passenger side fuse block (all clip and snap, takes about a minute and a haklf to completely remove it from truck) I followed the Camaro trick and "reset" the learn computer and problem is gone. I removed and reattached all three fuse box plugs, then I opened the driver door, rolled window down and held button for 3 extra seconds. I rolled window up, turned truck off, then closed door and restarted. this fixed error for me. Hope it helps.