Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. 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 BCM sets this DTC. This DTC indicates the use of a key with a transponder value that has not been learned by the BCM. The vehicle theft deterrent (VTD) system considers this to be a theft attempt.