P0572Brake Switch A Circuit Low
- 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. P0572 means the switch signal stays low – never pressed – although the car brakes. Ford petrol checks over 25 brake applications, Ford diesel over 40 decelerations; GM in the Saab 9-4X and 9-5 compares the input with the body module's message, 8 of 10 samples over 2 s. Cruise control is locked out; Ford shows only the wrench lamp.
- What you may notice
- Cruise control not working
- Brake lights not lit (depending on cause)
- Wrench lamp (Ford), no check engine light
- Likely causes
- LikelyBrake light switch faulty or misadjusted (not switching)
- PossibleBrake light or switch supply fuse blown
- PossibleSignal line open or shorted to ground, connector
- 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.