AutoCodes – Buick – C129F Buick

C129F Buick Code - Brake Pedal Position Sensor 4 Circuit Calibration

Quick Answer

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. Common causes include Faulty Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C129F Buick indicates Brake Pedal Position Sensor 4 Circuit Calibration.
Common causes
Common causes include Faulty Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 962
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Sep 04, 2020
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Code C129F Buick 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 C129F Buick - Brake Pedal Position Sensor 4 Circuit Calibration - AutoCodes.com
C129F Buick Code - Brake Pedal Position Sensor 4 Circuit Calibration

What are the Possible Causes of the DTC C129F Buick?

  • 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)

How to Fix the DTC C129F Buick?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C129F Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C129F Buick code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C129F Buick Code

1. What are the common symptoms of OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- Common symptoms include issues with the brake pedal position sensor, such as erratic readings, poor brake performance, or the illumination of the brake warning light on the dashboard.

2. What can cause the OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- The code C129F can be triggered by a faulty brake pedal position sensor, damaged wiring or connectors, or issues with the brake control module.

3. How can I diagnose the OBDII code C129F in my Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- Diagnosing this code typically involves using a diagnostic scanner to read the fault codes, checking the brake pedal position sensor for proper operation, and inspecting the wiring and connectors for any damage.

4. What are the potential dangers of ignoring the OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- Ignoring this code can lead to safety concerns due to potential brake system malfunctions, such as delayed braking response or loss of brake effectiveness.

5. Can I still drive my Buick with the OBDII code C129F related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper function of the brake system and compromise safety.

6. How can I repair the OBDII code C129F in my Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- Repairing this code may involve replacing the faulty brake pedal position sensor, repairing damaged wiring or connectors, or reprogramming/calibrating the brake control module.

7. Are there any DIY tips for fixing the OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- DIY tips may include checking and cleaning the connections to the brake pedal position sensor, conducting a visual inspection of the wiring, and ensuring the sensor is properly calibrated.

8. How much does it typically cost to repair the OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a couple of hundred dollars for parts and labor to more expensive repairs if the brake control module needs replacement.

9. Can a mechanic clear the OBDII code C129F in my Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration without fixing the underlying issue?

- While a mechanic can clear the code temporarily, it is important to address the root cause of the problem to ensure the safety and proper functioning of the brake system.

10. How long does it usually take to repair the OBDII code C129F in a Buick related to the Brake Pedal Position Sensor 4 Circuit Calibration?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from a few hours to a full day for more involved repairs.

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