I had the cameras stop working on my 2021 3500, took it in the first time and they disconnected the control module and reset everything. The second time they told me a battery had gone dead so they replaced it with a larger capacity battery. I drive every day and I have 2 batteries and dual alternators, so I suspect there is something going on with the batteries, not a draw. The dealership had to call the GM TAC line to get advice as they hadn't seen this issue before