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P0643 — Sensor Reference Voltage A Circuit High

5V sensor reference voltage is above specification.

Severity: HighRepair: $50-$1,000Difficulty: Advanced

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Common symptoms of P0643

Common causes of P0643

Repair cost & difficulty

Typical cost to fix P0643: $50-$1,000 · Difficulty: Advanced

Pro tip: Usually indicates PCM internal failure.

Vehicles commonly affected

All makes

Related trouble codes

P0641P0642

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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.