P0504
Brake Switch A/B Correlation
P0504 is an OBD-II diagnostic trouble code meaning: Brake Switch A/B Correlation. Common causes: brake pedal sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $22–56.
Symptoms
- Incorrect operation of brake lights
- Problems with cruise control
- Difficulty starting the engine
- Incorrect operation of the ABS system
Causes
- Brake pedal sensor malfunction
- Open or short circuit in wiring harness
- Contact corrosion
- Problems with the engine control unit (ECU)
How to Fix
- Check the condition of the brake pedal sensor
- Inspect the wiring harness for damage
- Check contacts for corrosion
- Test the operation of sensor circuits A and B
- If necessary, replace the sensor or repair the wiring harness
Related codes
Error P0504 by Vehicle Brand
FAQ
What does the P0504 code mean?
P0504 is an OBD-II diagnostic trouble code that indicates: Brake Switch A/B Correlation
What causes a P0504 error code?
The most common causes of P0504 include: Brake pedal sensor malfunction; Open or short circuit in wiring harness; Contact corrosion; Problems with the engine control unit (ECU).
How do I fix a P0504 diagnostic trouble code?
To fix P0504: Check the condition of the brake pedal sensor. Inspect the wiring harness for damage. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0504?
Limited driving only, diagnose soon
How much does it cost to fix P0504?
The estimated repair cost for P0504 is $22–56. Actual cost depends on your vehicle, location, and labor rates.
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