P057ABrake Pedal Position Sensor A Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- The brake pedal position sensor is an analogue 5 V sensor, usually Hall-type, giving the pedal position continuously instead of a switch – for brake lights, cruise control, stop-start, brake-throttle override and regenerative braking. GM (from about 2012) and Stellantis read it in the engine module, Saab's 9-4X and 9-5 in the body module; its learned rest position (about 1 V) must be relearned after replacement. P057A is the general circuit or open-circuit fault. No manufacturer document available to us uses it; GM reports an open circuit as P057C or P057D depending on the line, type A with one trip, and sets the pedal position to 0 %. Brake detection then relies on the brake light switch.
- What you may notice
- Check engine light on
- Cruise control and stop-start inoperative
- Possible power reduction
- Likely causes
- LikelyConnector at the sensor loose or corroded, pins pushed back
- Possible5 V reference, signal or ground line open
- PossibleSensor faulty internally
- RareEngine or body module
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.