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Password Learn Procedure For Anti-Theft System (4.3L, 4.8L, 5.3L & 6.0L)

  1. Password relearn procedure must be performed if passlock sensor, Body Control Module (BCM), PCM or Vehicle Control Module (VCM) are replaced. Ensure battery is fully charged.
  2. Using scan tool, erase Diagnostic Trouble Codes (DTC). Turn ignition switch from OFF to CRANK position, allowing vehicle to try and start. Vehicle will start and then stall. Leave ignition on while observing SECURITY indicator on instrument panel. When security indicator turns off (after about 10 minutes), turn ignition off. Wait 10 seconds. Repeat this step 3 more times. New password will be learned on next start attempt.
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