Mike_72

UPDATE: Problem has returned after replacement on the camera module computer box by the dealer. Will be taking the truck back for more troubleshooting. UPDATE #2: Took the 2500HD back to GM two days ago. They could not get the camera system to fault (the problem is random). They went ahead and replaced the tailgate camera just to see if that solves the issue. So far 2 days of driving I have not had the camera system fault..... UPDATE #3: Since the tailgate camera was removed and replaced the system has been working without a single issue for over a month now. This must have been the issue somehow... (once or twice the system would show the tailgate cam view grayed out when it was not showing a total failure black screen which was the normal failure mode) The dealer changed out the tailgate cam just to see if that was the issue as every time I took it the dealer the cameras would work fine... go figure... But I am happy to report no more issues and I think this mystery is solved.....

2021 HD 2500 here. Camera system blacks out and shows the ! symbol with camera icon and a line though it. Sometimes it is working fine and sometimes it goes out partially or fully. I dropped the truck off at GMC to diagnose and they said it is a bad camera module which is covered under my CPO warranty. Hope this information helps someone....