P057B
Brake Pedal Position Sensor A Circuit Range or Performance
Same as P057A with the signal in plausible range yet not matching the brake-light switch state - typical for a sensor offset against pedal travel or a worn potentiometer track.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Potentiometer track wornCommon
Parts involved
- Brake Pedal Position Sensor A
P057B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.