Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Thank you for that information. Have you checked for codes in the computer?
I would check to be sure that the body control module is powering up the back up lamp relay located in the underhood fuse block. This happens when the BCM gets a signal from the ECM over the BUS circuit. It is possible that the transmission range sensor, ECM or even the BCM is at fault. I bet there are codes stored in the BCM related to this problem. If not, then check for two powers and one ground going into the back up lamp relay with the transmission in reverse. Here is a wiring diagram.
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