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

P057D Brake Pedal Position Sensor A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The brake pedal position sensor A is an analogue 5 V sensor giving pedal travel continuously; its rest position (about 1 V) is learned. GM reads it in the engine module from about 2012 and uses it as an enabling condition of transmission monitors – hence type A, warning lamp after one trip, unlike cruise control codes. On any circuit fault GM sets the pedal to 0 %, so brake detection relies on the brake light switch. P057D means the signal is too high: GM above 95 in 20 of 32 samples and calls this explicitly an open circuit – an open signal or ground line is pulled up. A short to 5 V or battery acts the same. 'High' means signal, not a fully pressed pedal. GM bulletins name connector X205 on 2012–14 pick-ups.

Likely causes

Ground or signal line open, connector X205 with poor contact
Sensor faulty
Signal shorted to voltage
Sensor misinstalled or misadjusted

Symptoms

  • Check engine light on (GM, one trip)
  • Cruise unavailable, brake light or stability messages
  • Possible power reduction

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–300
Time0.5–2 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

P057AP057BP057CP057EP0573

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