P057BBrake Pedal Position Sensor A Circuit Range/Performance
- 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. P057B means the signal is valid but the pedal does not move as expected or the rest position is wrong. GM rates pedal movement once per ignition cycle while driving at 8 km/h or more without throttle (fail below 0.40, pass above 0.80), type A, one trip. If the module sees the pedal slightly pressed, it cuts power – GM and Stellantis bulletins name misinstalled or wrongly learned sensors.
- What you may notice
- Check engine light on
- Reduced power when accelerating
- Cruise control and stop-start inoperative
- Likely causes
- LikelySensor misinstalled or not learned after replacement
- PossibleContact fault on 5 V reference or signal causes wrong rest position learning
- PossibleSensor faulty internally (sticking)
- RarePedal mechanism stiff, floor mat
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.