What this code means

The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.

Symptoms

• Check Engine Light
• Engine momentary stumble
• Loss of adaptive data
• Multiple codes may be stored

Common causes

• Intermittent power supply to PCM
• Loose PCM connector
• Internal PCM failure
• Low battery voltage
• Ignition switch issue

Diagnostic steps

1. Check all PCM power and ground circuits
2. Inspect PCM connectors
3. Test battery and charging system
4. Monitor PCM power with oscilloscope for dropouts
5. Check ignition switch

Repair notes

Check PCM power and ground connections. Verify battery and charging system. Replace PCM if internal fault confirmed.

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