Conditions for Setting the DTC
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
If the transponder value from the ignition key does not match the one stored in memory, the theft deterrent control module sets this DTC. This DTC indicates the use of a key with a transponder value that has not been learned by the theft deterrent control module. The vehicle theft deterrent (VTD) system considers this to be a theft attempt.