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P0604 — Internal Control Module RAM Error

PCM RAM (Random Access Memory) has failed a self-test.

Severity: HighRepair: $500-$1,500Difficulty: Advanced

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Common symptoms of P0604

Common causes of P0604

Repair cost & difficulty

Typical cost to fix P0604: $500-$1,500 · Difficulty: Advanced

Pro tip: Usually indicates PCM replacement is needed. Try a battery disconnect first to see if it clears.

Vehicles commonly affected

All makes

Related trouble codes

P0600P0601P0606

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.