AutoCodes – Buick – C129E Buick

C129E Buick Code - Brake Pedal Position Sensor 4 Circuit High Input

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
C129E Buick indicates Brake Pedal Position Sensor 4 Circuit High Input.
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 879
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 C129E 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 C129E Buick - Brake Pedal Position Sensor 4 Circuit High Input - AutoCodes.com
C129E Buick Code - Brake Pedal Position Sensor 4 Circuit High Input

What are the Possible Causes of the DTC C129E 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 C129E 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 C129E 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 C129E Buick code?

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Need Help with the 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 C129E Buick Code

1. What are the common symptoms of OBDII code C129E in a Buick related to the Brake Pedal Position Sensor 4 Circuit High Input?

- Common symptoms include the illumination of the check engine light, issues with the braking system, and potential loss of brake pedal functionality.

2. What are the possible causes of OBDII code C129E in a Buick indicating a Brake Pedal Position Sensor 4 Circuit High Input?

- The code C129E 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 C129E related to the Brake Pedal Position Sensor 4 Circuit High Input in my Buick?

- Diagnosing this code involves using a scan tool to retrieve the specific fault code, checking the brake pedal position sensor for proper operation, and inspecting the associated wiring for any damage.

4. What are the potential risks of ignoring OBDII code C129E indicating a Brake Pedal Position Sensor 4 Circuit High Input in my Buick?

- Ignoring this code can lead to safety hazards due to potential brake system malfunctions, reduced braking performance, and an increased risk of accidents.

5. Can I continue to drive my Buick with OBDII code C129E related to the Brake Pedal Position Sensor 4 Circuit High Input?

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

6. How can I repair OBDII code C129E in my Buick caused by a Brake Pedal Position Sensor 4 Circuit High Input?

- Repairing this code may involve replacing the brake pedal position sensor, repairing or replacing damaged wiring, or addressing any issues with the brake control module.

7. Is it possible to reset OBDII code C129E related to the Brake Pedal Position Sensor 4 Circuit High Input in my Buick without fixing the underlying issue?

- Resetting the code without addressing the root cause will only temporarily clear the check engine light, but the issue will likely reoccur until the problem is properly fixed.

8. How much does it typically cost to repair OBDII code C129E in a Buick due to a Brake Pedal Position Sensor 4 Circuit High Input?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Are there any preventive maintenance steps I can take to avoid encountering OBDII code C129E related to the Brake Pedal Position Sensor 4 Circuit High Input in my Buick?

- Regularly inspecting and maintaining the brake system, including the brake pedal position sensor, can help prevent issues that may trigger this code.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code C129E on a Buick caused by a Brake Pedal Position Sensor 4 Circuit High Input?

- Depending on the specific cause, some DIY enthusiasts may be able to address this issue by following repair guides or tutorials, but it is recommended to consult with a professional mechanic for proper diagnosis and repair.

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