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 P0703: - Brake Switch B Input Circuit
2009 Ford Fusion SEL, 3.0 1, FWDSECTION DTC P0703: - Brake Switch B Input Circuit
DTC P0703: - BRAKE SWITCH B INPUT CIRCUIT
| Description: | Indicates the powertrain control module (PCM) did not receive a brake pedal position (BPP) input. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check for correct function of the stoplamps. Using a scan tool, check the BPP PID. The stoplamps and PID should toggle on and off with brake pedal activation. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Town Car | Verify the brake pedal was applied and released during the key on engine running (KOER) self-test. For additional concerns, refer to the EXTERIOR LIGHTING . | ||
| Expedition, Navigator | Verify the brake pedal was applied and released during the key on engine running (KOER) self-test. For additional concerns, refer to the ANTI-THEFT - PASSIVE ANTI-THEFT SYSTEM (PATS) service information. | ||
| All others | GO to Pinpoint Test FD . | ||
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.