P057DBrake Pedal Position Sensor A Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light on (GM, one trip)
- Cruise unavailable, brake light or stability messages
- Possible power reduction
- Likely causes
- LikelyGround or signal line open, connector X205 with poor contact
- PossibleSensor faulty
- RareSignal shorted to voltage
- RareSensor misinstalled or misadjusted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.