Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Your vehicle security system can be reset in 2 different ways one is faster and requires a scan tool, and the other takes 30 minutes and doesn't require a scan tool.
Try this, step 7 states scan tool, but code will eventually reset.
30 Minute Learn Procedure
Important: The vehicle learns the PasslockTM Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
Is the security lamp on now?
Did it come on and go off while doing the 30 min relearn?