So my backup camera on my 20' Traverse (45K mile) would occasionally not display when backing up. Now all my cameras are not functional. I just have a black screen with a crossed out camera logo. Nearest dealer is 3+ hours away so not an option at the moment. Thanks in advance for any help.

 

either the cameras failed , or there's a fault in the wiring/connectors etc.

 

so you think all three cameras failed at pretty much the same time? And the wiring ?

 

you said first one went, then the others.
There's many possibilities. Someone would have to do more investigation and diagnose with the right electronic tools.
I would also search all the GM technical bulletins to see if it's a known defect.