you need to perform the 30 minute GM relearn procedure.
30 minute GM relearn procedure:
1-Turn ON the ignition, with the engine
2-Attempt to start the engine, then release the key to ON (vehicle will not start).
3-Observe the SECURITY telltale(this is the security light), after approximately 10 minutes the telltale will turn OFF.
4-Turn OFF the ignition, and wait 5 seconds .
5-Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK). IMPORTANT: The vehicle learns the Passlock(TM) 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.
6-Start the engine (the vehicle has now learned the Passlock(TM) Sensor Data Code and/or password).
If, after doing this, the security system still is preventing the engine from cranking, then there is a failure in the Passlock system that can only be diagnosed with a factory level scan tool - either a faulty key, ignition switch or Passlock control module. Unfortunately, this would mean having it towed to a shop at that point.
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