P0504: Brake Switch A / B Correlation
MediumPowertrainBraking System
What does P0504 mean?
P0504 is a diagnostic trouble code indicating "Brake Switch A / B Correlation". This code relates to your vehicle's braking system and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- ABS warning light on
- Brake pedal feels different
- Unusual braking behaviour
Estimated repair cost
Typical range in Australia (parts + labour)
$200 – $1000 AUD
Common causes
- Faulty braking system component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
Get a diagnosis for YOUR car
Code P0504 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.