Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0504 - Brake Switch A/B Correlation
2021 Ford Edge SE, 4WDSECTION DTC P0504 - Brake Switch A/B Correlation
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
P0504 - BRAKE SWITCH A/B CORRELATION
| Description: | The PCM does a comparison test between the brake pedal position sensor (BPS) and the brake pedal position (BPP) switch. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check the state of the BOO1 and BOO2 PIDs. The BOO1 PID is normally open and BOO2 PID is normally closed. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST AI . | ||
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.