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AutoCodes - Generic - C129B

C129B Code - Brake Pedal Position Sensor 3 Circuit High Input

- Code Popularity: 686 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC C129B?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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)
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How to Fix the DTC C129B?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C129B code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code C129B 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 C129B - Brake Pedal Position Sensor 3 Circuit High Input - AutoCodes.com
C129B Code - Brake Pedal Position Sensor 3 Circuit High Input

Need More Information on the Code?

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Information for Specific Makes

  • C129B Buick Brake Pedal Position Sensor 3 Circuit High Input
  • C129B Cadillac Brake Pedal Position Sensor 3 Circuit High Input
  • C129B Chevrolet Brake Pedal Position Sensor 3 Circuit High Input
  • C129B GMC Brake Pedal Position Sensor 3 Circuit High Input

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Code C129B comments

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