Faulty park brake switch or sensor giving a stuck or out-of-range signal; Damaged, chafed or corroded wiring with a short to voltage in the signal circuit; Corroded, loose or water-damaged connector at the switch, sensor or control unit; Mechanical fault or misadjustment of the handbrake lever or actuator, so the switch reads incorrectly; Low or unstable supply voltage or poor earth affecting the circuit reference; Fault in the control unit that monitors the park brake signal.

P05E5

Park Brake Sensor/Switch Circuit High.

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
E5: FaultThe specific fault in that area

What it means

P05E5 is a generic code meaning the control unit has detected a high voltage signal in the park brake sensor or switch circuit. The signal sits above the expected range, which can point to a short to voltage, a faulty switch or sensor, or a wiring or connector fault. Exact thresholds and how the parking brake status is used vary by make and model.

Symptoms

Parking brake warning light on or flashing on the dashboard
Warning light stays on even with the parking brake released
Warning light does not come on when the parking brake is applied
Electric parking brake not applying or releasing as expected
Hill start assist or auto hold not working
Other driver assistance or stability warnings may show alongside the code

Possible causes

Faulty park brake switch or sensor giving a stuck or out-of-range signallikely
Damaged, chafed or corroded wiring with a short to voltage in the signal circuitlikely
Corroded, loose or water-damaged connector at the switch, sensor or control unitpossible
Mechanical fault or misadjustment of the handbrake lever or actuator, so the switch reads incorrectlypossible
Low or unstable supply voltage or poor earth affecting the circuit referencepossible
Fault in the control unit that monitors the park brake signalrare

How to diagnose

Read all stored codes and freeze frame data, noting whether other brake, body or network codes are present, then record and clear to see if P05E5 returns.
Check the parking brake warning light behaviour with the brake applied and released, and compare with the live data for park brake status if available.
Visually inspect the parking brake lever, switch, actuator and their wiring for damage, corrosion, water ingress or rubbing.
Disconnect and inspect the switch or sensor connector for bent, corroded or pushed-back pins, and check for a good fit.
Check the battery condition and charging voltage, as low or unstable voltage can upset sensor signals.
Using the manufacturer wiring diagram, measure the signal circuit for a short to voltage, and check the earth and reference supply.
Test the switch or sensor operation and resistance or voltage against the specification for that model.
Check the handbrake mechanism or actuator for correct adjustment and movement, following model-specific procedures.

How to fix

Replace the faulty park brake switch or sensor.
Repair or replace damaged wiring and fix any short to voltage in the circuit.
Clean, repair or replace corroded or damaged connectors and terminals.
Adjust or repair the handbrake lever, cable or electric parking brake actuator so the switch reads correctly.
Repair battery, charging or earth faults found during testing.
Replace or reprogram the control unit only if testing confirms it is faulty and the manufacturer procedure calls for it.

Can I keep driving?

Medium severity

The car can usually be driven short-term, but the parking brake may not hold or release properly, so have it checked soon. If the parking brake will not release, or the main brake warning light is also on, do not drive it.

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