What this code means

The PCM did not receive the expected security password from the Body Control Module (BCM) or Vehicle Theft Deterrent module. The theft deterrent system disables the vehicle if the correct key/password is not verified.

Symptoms

• Vehicle will not start
• Check Engine Light
• Security light flashing
• Engine cranks but does not fire
• Intermittent no-start condition

Common causes

• Faulty ignition key or key transponder
• Passlock sensor failure
• Body Control Module (BCM) malfunction
• Wiring issue between BCM and PCM
• Ignition lock cylinder failure

Diagnostic steps

1. Attempt start with known-good key
2. Check security system indicator light status
3. Test communication between BCM and PCM
4. Inspect Passlock sensor connector
5. Check for BCM-related codes

Repair notes

Try 10-minute relearn: turn key to ON for 10 minutes until security light stops flashing, then turn off and restart. If persistent, replace Passlock sensor or BCM.

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