Code Definition

P057B — Brake Pedal Position Sensor Signal not Changing

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P057B

P057B is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P057B is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P057B is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P057B fault code is set when the Engine Control Module (ECM) detects that the signal from the brake pedal position sensor is not changing as expected. This sensor is used to determine the position of the brake pedal and is crucial for various vehicle systems, including the cruise control, stability control, and anti-lock braking system (ABS). The sensor's signal should vary as the brake pedal is pressed and released, reflecting the pedal's movement. If the ECM observes that the sensor's signal remains constant despite changes in the brake pedal's position, it indicates a possible malfuncti...

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