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Yes. The issue has not recurred.

For what it's worth, it looks like the dealership just reprogrammed my video processing control module. So not a new part. Good luck to both of you.

Took my Tahoe to Bay Ridge Chevrolet this morning and it looks like the problem has been fixed! Thanks, folks. For others looking for the fix, my invoice says: CUSTOMER STATES BACK UP CAMERA INOP CHECK ALL CAMERAS NO COMMUNICATION TO VIDEO PROCESSING MODULE REPROGRAM MODULE CAMERA WORKS 2810845 Video Processing Control Module Reprogramming

Bought a 2021 Tahoe Z71 with ~28,000 miles. Cameras worked for a few days. One time, I got into the truck, plugged my iPhone in (which I had been doing since I got it), put it in reverse and all cameras stopped working. Now have the same error as the original poster (with the red triangle/exclamation point and camera icon, otherwise black screen). Has anyone found a reliable fix? I have tried everything suggested on this forum (closing liftgate hard, waiting until boot-up screen disappears, etc.) and I still can't get any of the cameras to work at all.