Conditions for Setting the DTC
WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
DTC B2545 01
The BCM detects a short to voltage in the backup lamps control circuit.
DTC B2545 02
The BCM detects a short to ground in the backup lamps control circuit.
DTC B2545 04
The BCM detects an open/high resistance in the backup lamps control circuit.