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P0504 — Brake Switch A/B Correlation

Brake switch signals don't agree with each other.

Severity: MediumRepair: $20-$150Difficulty: Easy

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Common symptoms of P0504

Common causes of P0504

Repair cost & difficulty

Typical cost to fix P0504: $20-$150 · Difficulty: Easy

Pro tip: On Ford, worn nylon bushing on brake pedal arm is $5 fix. Brake switch itself is $10-30.

Vehicles commonly affected

All makes — common on Ford, Toyota

Related trouble codes

P0571

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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.