What it means
Same as P057E on sensor B. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
How it works
Brake pedal position sensor B sends a changing signal to the control module as the pedal moves. This code sets when that signal drops out or varies unpredictably rather than changing consistently, often because of a loose connection or vibration-sensitive wiring fault.
Common causes
Most likely first.
- Intermittent contact at connector
- Connector with intermittent contact under vibration
- Harness routed against vibrating component
Symptoms
- Brake or check-engine warning light may illuminate
- Brake-related functions may operate inconsistently
How to diagnose it
- Check freeze-frame data and record live sensor B readings while slowly pressing and releasing the pedal, comparing them with sensor A.
- Inspect sensor B's connector for loose fit, corrosion, moisture, or terminals that may lose contact under vibration.
- With live readings displayed, gently move the connector and harness to try to reproduce a signal dropout.
- Inspect the harness route for chafing or contact with vibrating components, and check terminal fit and circuit continuity using the manufacturer's procedure.
- If connections and wiring remain stable, test sensor B for an intermittent internal fault.
Common fixes
- Secure a loose sensor B connector and support the harness against vibration.
- Repair chafed wiring and reroute it away from moving or vibrating parts.
- Clean or replace terminals with intermittent contact.
- Replace sensor B if its output remains erratic with a sound circuit.
Can I keep driving?
Brake-related electronic functions may work inconsistently, so avoid relying on stop-start or other assistance until the fault is diagnosed. If a brake warning appears or braking behavior changes, stop safely and seek prompt inspection.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.