Possible Cause

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

The following items may be area of concern:

Back-up light ground circuit open.
Fused ignition switch output circuit open.
Back-up light feed circuit shorted to ground.
Back-up light feed circuit open.
Defective Transmission Range (TR) sensor.
Open back-up light bulb.