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Theft Deterrent DTCS

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
THEFT DETERRENT DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description
DTC B2947 Short To Ground On Passlock™ Sensor Power Circuit
DTC B2948 Sensed Battery Voltage
DTC B2957 BCM Signal Input Voltage Low
DTC B2958 BCM Signal Input Voltage High
DTC B2960 Valid But Different Code Value Than Previously Learned From Passlock™ Sensor
DTC B3031 BCM In Learn Mode But Does Not See A Valid Passlock™ Sensor Code
DTC B3033 BCM Is Reading A Tamper Code From Passlock™ Sensor
DTC P1626 PCM Has Not Established Communications With BCM
DTC P1631 PCM Did Not Receive A Valid Password