Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
have you done a security relearn?
Use this procedure after replacing any of the following components:
•The PASS-Key III plus keys
•The theft deterrent module (TDM)
•The powertrain control module (PCM)
This procedure is not available on vehicles equipped with EXPORT configured TDMs.
•When performing the 30-minute relearn procedure, all previously learned keys will be erased from the TDM memory. Additional keys may be learned after performing the relearn procedure.
When replacing a TDM with a GM SPO Replacement Part, ensure the procedure to setup a new TDM is performed prior to the 30-Minute Relearn Procedure.
Important: The vehicle learns the key transponder information and/or passwords on the ignition switch transition from OFF to RUN. You must turn the ignition OFF before attempting to start the vehicle.
do these steps sometimes you can get it out of theft mode this way