Diagnostic Aids
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
If DTC 45 is set, remote transmitter is out of synchronization with Body Control Module (BCM). This can be caused by a remote transmitter was in program mode while out of BCM Radio Frequency (RF) signal range, or remote transmitter is defective.