P1703moderate severityPowertrain
Brake Switch Out of Self-Test Range
on 2021 Ford Mustang Mach-E Standard Range Dual Motor AWD · RWD
What this code means
The brake switch signal is not within the expected range during the KOER self-test. The brake switch signal is used by the transmission for torque converter clutch disengagement and cruise control operation.
Symptoms
- Check Engine Light
- Cruise control inoperative
- TCC may not disengage when braking
- Brake lights may not work
- Shift interlock may not release
Common causes
- Brake switch out of adjustment
- Faulty brake switch
- Brake pedal not pressed during self-test
- Wiring issue
Diagnostic steps
- Press and release brake pedal during KOER self-test
- Test brake switch operation (should change state when pedal is pressed)
- Check brake light operation
- Inspect brake switch wiring
Repair notes
Adjust or replace brake switch. Press brake during self-test.
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