P0573Brake Switch A Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- Brake switch A is the brake light switch or its signal to the engine module. The module needs it to cancel cruise control and for brake-throttle override, stop-start, idle control and the shift interlock. As cruise control is simply switched off, CARB treats such faults as emission-neutral – usually without warning lamp. P0573 means the switch signal stays high – always pressed – although the car is not braking. Ford diesel checks over 40 accelerations, Ford petrol over 25 brake applications without warning lamp; GM in the Saab 9-4X compares the input with the body module, 8 of 10 samples over 2 s. Typical are a switch stuck closed, a pedal not fully returning or a short to positive. Cruise control is locked out.
- What you may notice
- Brake lights permanently on
- Cruise control unusable
- Shift interlock disturbed
- Likely causes
- LikelyBrake light switch stuck closed or misadjusted (pedal stop buffer missing)
- PossibleBrake pedal not returning fully (floor mat, return spring)
- PossibleSignal line shorted to positive
- RareBody or engine module
- Repair
- Easy · Often possible to do yourself.Typical cost: €15 – €120
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.