C129E - Brake Pedal Position Sensor 4 Circuit High Input

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Brake Pedal Position Sensor
  • Brake Pedal Position Sensor harness is open or shorted
  • Brake Pedal Position Sensor circuit poor electrical connection
  • Faulty Electronic Brake Control Module (EBCM)

Possible symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C129e Description

The Electronic Brake Control Module (EBCM) uses inputs from the electronic brake control brake pedal position sensor to determine when the brake is applied and how much force is used. The electronic brake control module monitors when the driver's foot is on the brake and locks the offset. The offset is locked when 3 out of the 4 inputs indicate the brake pedal is applied. The 4 inputs are brake pedal travel 1, brake pedal travel 2, master cylinder pressure sensor, and the brake pedal position sensor. These inputs are used to determine the driver's braking intent which is used to the control amount of pressure applied to the wheels.
OBDII Code C129e - Brake Pedal Position Sensor 4 Circuit High Input - AutoCodes.com

C129E Information for specific makes

  • C129E BUICK Brake Pedal Position Sensor 4 Circuit High Input
  • C129E CADILLAC Brake Pedal Position Sensor 4 Circuit High Input
  • C129E CHEVROLET Brake Pedal Position Sensor 4 Circuit High Input
  • C129E GMC Brake Pedal Position Sensor 4 Circuit High Input

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