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DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P05E6

P05E6Park Brake Sensor/Switch Circuit Range/Performance

P05E6 indicates that the powertrain control module (PCM) has detected an out-of-range or erratic signal from the park brake sensor or switch circuit, meaning the voltage or performance does not match expected values for the current park brake state. The PCM compares the park brake switch input against other inputs such as vehicle speed and transmission range to determine if the circuit is functioning correctly.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • The parking brake warning light may stay illuminated constantly or fail to illuminate when the brake is applied.
  • A message such as 'Park Brake Fault' or 'Service Parking Brake' may appear on the instrument cluster display.
  • The vehicle may not recognize that the parking brake is engaged, potentially affecting automatic hold or hill-start assist features.
  • Cruise control may be disabled or may not engage if the PCM cannot confirm the park brake is released.
  • Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

  1. Faulty park brake switch or sensor, such as worn contacts or internal failure.
  2. Damaged or corroded wiring harness or connector at the park brake switch.
  3. Poor ground connection for the park brake switch circuit.
  4. Mechanical binding or misalignment of the park brake pedal or lever preventing the switch from actuating correctly.
  5. Water intrusion or debris in the switch connector causing intermittent signals.
  6. PCM software issue or internal fault in the park brake input circuit (less common).

How to diagnose and fix it

  1. Verify the park brake warning light operation and check for any related diagnostic trouble codes (DTCs) using a scan tool.
  2. Inspect the park brake switch and connector for physical damage, corrosion, or loose pins.
  3. Test the switch continuity with a multimeter while cycling the park brake on and off.
  4. Check the wiring harness for shorts to ground or power, and repair any damaged wires.
  5. Verify the park brake mechanism moves freely and the switch is properly actuated.
  6. Clear the DTC and test-drive the vehicle to confirm the repair.
  7. If the fault persists, follow the manufacturer's diagnostic flow chart, which may involve testing the PCM input circuit.

Before replacing the park brake switch

  • A common oversight is a misadjusted or sticky park brake pedal that fails to fully release, leaving the switch in an intermediate state that sets the code.
  • Corrosion inside the switch connector often mimics a failed switch, so always inspect and clean the terminals before condemning the component.
  • The code can be set by a low battery or charging system issue that causes voltage spikes, so check the battery and charging system first.
  • On vehicles with electronic parking brakes, the park brake switch signal may be processed by a separate control module, so a scan tool that can read all modules is essential.
  • Intermittent faults may not set a hard code but can be stored as pending; always check pending codes and freeze-frame data.

Can I keep driving with P05E6?

The vehicle is generally safe to drive because the park brake system remains functional, but the warning light may be illuminated and some features like cruise control could be disabled. Avoid relying on automatic park brake features until the fault is repaired.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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