Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Did you just replace this radio
Unfortunately the CAL ERR is inside the radio and it requires a scan tool to reprogram. There are shops that are not a dealer that can do this programming. There is no code or sequence that I can give you to unlock or fix this. If there was, rest assured I would, but there is not. Sorry.
THis is a full scan tool for the WHOLE vehicle. a simple code reader is not something that can work as they are for the emissions and engine only.