What this code means

The ECM detected an internal hardware or software malfunction. The ECM self-diagnostic routines have identified a failure in one of its internal circuits or memory areas.

Symptoms

• Check Engine Light
• Various driveability issues
• Other fault codes may appear
• Intermittent problems

Common causes

• ECM internal circuit failure
• ECM memory corruption
• Voltage spike or brown-out damage
• ECM software error
• Poor ECM ground connection

Diagnostic steps

1. Check all ECM power and ground connections
2. Clear codes and verify if fault returns
3. Update ECM software to latest version
4. Test ECM supply voltage stability
5. Replace ECM if internal fault confirmed

Repair notes

Update ECM software; replace ECM if internal malfunction persists after reprogramming.

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