What causes fault code P057A?

• Most likely: Faulty brake pedal position sensor (potentiometer or Hall effect sensor) • Likely: Loose connection or corrosion in the sensor connector • Possible: Damaged wiring harness (chafing against the steering column or pedal assembly) • Rare: Misadjusted brake pedal geometry or internal ECM fault

Powertrain (Engine & Gearbox)Standard EOBD

P057A - Cruise Control Brake Pedal Sensor Circuit

Q: What are the symptoms of fault code P057A?

• Cruise control cannot be engaged • Error message in the instrument cluster (e.g., 'Service Cruise Control') • Cruise control disengages unexpectedly during driving • Check engine light (MIL) may be illuminated • Brake lights might stay on or fail to operate (depending on vehicle architecture)

Q: How do you fix fault code P057A?

STEP 1: Check brake light operation and inspect the connector at the brake pedal for corrosion or bent pins. STEP 2: Use a diagnostic tool to monitor Live Data. Verify that the 'Brake Pedal Position' percentage changes smoothly as the pedal is depressed. STEP 3: Measure the reference voltage to the sensor (typically 5.0V) and ground integrity (<0.1 Ohm). The signal wire should show varying voltage (approx. 0.5V to 4.5V). STEP 4: If wiring and power are okay but the signal is erratic or frozen, replace the brake pedal sensor. Perform a sensor recalibration via the scan tool if required by the OEM.

Last updated:1 February 2026

Related:Bromspedalsensor, Engine Control Unit (ECU), Wiring Harness, Connector

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0500

Vehicle Speed Sensor (VSS) 'A' Range/Performance

P0501

Vehicle Speed Sensor 'A' Range/Performance

P0502

Vehicle Speed Sensor 'A' Circuit Low Input

P0503

Vehicle Speed Sensor (VSS) Intermittent/Erratic/High

Technical Description

Diagnostic Trouble Code (DTC) P057A is stored when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an electrical malfunction or an out-of-range signal from the brake pedal position sensor circuit specifically associated with the cruise control system. This sensor monitors the exact position of the brake pedal to safely disengage cruise control. If the signal voltage deviates from the calibrated range (typically monitored between 0.5V and 4.5V), the ECM will disable the speed control system as a safety protocol via CAN-bus logic to ensure the vehicle can be decelerated reliably.

Possible Causes

Faulty brake pedal position sensor (potentiometer or Hall effect sensor)

Loose connection or corrosion in the sensor connector

Damaged wiring harness (chafing against the steering column or pedal assembly)

Misadjusted brake pedal geometry or internal ECM fault

Symptoms

Cruise control cannot be engaged

Error message in the instrument cluster (e.g., 'Service Cruise Control')

Cruise control disengages unexpectedly during driving

Check engine light (MIL) may be illuminated

Brake lights might stay on or fail to operate (depending on vehicle architecture)

Do you also have
other fault codes?

See how P057A connects with your other fault codes. Our advanced analysis tool identifies causal relationships and root causes directly.

Analyze multiple codes

P057A - Cruise Control Brake Pedal Sensor Circuit

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have
other fault codes?

P057A - Cruise Control Brake Pedal Sensor Circuit

Related Fault Codes

Technical Description

Possible Causes

Symptoms

Recommended Solution

Workflow

Mechanic's Tip

Do you also have other fault codes?

Do you also have
other fault codes?