Resetting the Security Code for a 2002 Chevy Trailblazer is not difficult. In fact there is not a specific code, but rather a specific sequence of steps to follow to reset your Trailblazer's security system.
Wait 10 minutes from the time the security system is enabled before trying to restart the engine. The purpose of the "Passport" security feature on the 2002 Chevy Trailblazer is to disable the fuel system if the vehicle is started with an invalid key.
Insert the valid manufacturer key into the ignition switch and turn to the start mode. Hold into the start mode until the ignition starts.
Repeat Step 2 three times until the system has reset and the ignition starts. If, after repeating Step 2 three times, the car still does not start, see a certified GM dealer. Damage can occur to the ignition switch when the incorrect key is placed into the ignition switch.
