Damaged, chafed or corroded wiring to the brake pedal position sensor; Loose, corroded or contaminated connector at the sensor or control unit; Worn or failing brake pedal position sensor; Sensor or pedal linkage misaligned, loose or incorrectly fitted after previous work; Low or unstable reference voltage or poor earth affecting the sensor circuit; Fault in the control unit that reads the sensor, or an outdated calibration where the manufacturer has issued an update.

P057E

Brake Pedal Position Sensor A Circuit Intermittent/Erratic.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
7E: FaultThe specific fault in that area

What it means

P057E means the engine or powertrain control unit has seen the brake pedal position sensor signal drop out, jump or behave erratically, when it should change smoothly with pedal movement. The sensor reports pedal travel, so a signal that is intermittent or implausible is logged as a circuit fault. How the signal is used (cruise cancel, brake lights, stop-start, torque management) varies by model.

Symptoms

Warning light on, such as the engine light or a brake system warning
Brake lights stay on, don't come on, or flicker
Cruise control or speed limiter cancels or won't engage
Stop-start system disabled, or the engine stalls or hesitates when braking
Reduced engine power or limp mode on some models
Intermittent fault that comes and goes with pedal movement or road bumps

Possible causes

Damaged, chafed or corroded wiring to the brake pedal position sensorlikely
Loose, corroded or contaminated connector at the sensor or control unitlikely
Worn or failing brake pedal position sensorlikely
Sensor or pedal linkage misaligned, loose or incorrectly fitted after previous workpossible
Low or unstable reference voltage or poor earth affecting the sensor circuitpossible
Fault in the control unit that reads the sensor, or an outdated calibration where the manufacturer has issued an updaterare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting whether other brake, cruise or stability faults are present.
Check the brake lights work properly and that nothing else fouls the pedal, such as a floor mat or stray object.
Inspect the sensor, its mounting and the pedal linkage for looseness, damage or misalignment.
Inspect the wiring and connector at the sensor and along the loom for chafing, water ingress, corrosion or bent pins, then wiggle-test the harness with live data on.
Watch the pedal position live data while slowly pressing and releasing the pedal, looking for dropouts, spikes or steps in the signal.
Check the sensor's supply voltage, signal and earth against the manufacturer's specification for that model.
Check for relevant software updates or technical bulletins for the vehicle.
After repairs, clear the code and road test to confirm it doesn't return.

How to fix

Repair or replace damaged wiring, and secure the loom away from sharp edges or heat.
Clean or replace corroded or loose connector terminals.
Replace the brake pedal position sensor if its signal is erratic, then adjust or calibrate it as the manufacturer specifies.
Refit or realign the sensor and pedal linkage correctly.
Repair supply or earth faults, and update the control unit calibration only if a known fault is confirmed.

Can I keep driving?

Medium severity

The car can usually be driven short-term, but get it checked soon, as brake light operation and some driver aids may be affected. If the brake lights don't work reliably or the car loses power, avoid driving it until it's fixed.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.