Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P057B Brake Pedal Position Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Sensor misinstalled or not learned after replacement
Contact fault on 5 V reference or signal causes wrong rest position learning
Sensor faulty internally (sticking)
Pedal mechanism stiff, floor mat

Symptoms

  • Check engine light on
  • Reduced power when accelerating
  • Cruise control and stop-start inoperative

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–350
Time0.5–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

brake pedal position sensorsensor wiringengine control module

Related codes

P057AP057CP057DP057EP0504

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, gm-techlink.com.