AutoCodes – Generic – C129F

C129F 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 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.

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Code Popularity 1,302

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C129F 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 - Brake Pedal Position Sensor 4 Circuit Calibration - AutoCodes.com — C129F Code - Brake Pedal Position Sensor 4 Circuit Calibration

What does this mean?

What are the Possible Causes of the DTC C129F?

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?

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 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 code?

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Need Help with the Code?

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Information for Specific Makes

C129F Buick — Brake Pedal Position Sensor 4 Circuit Calibration
C129F Cadillac — Brake Pedal Position Sensor 4 Circuit Calibration
C129F Chevrolet — Brake Pedal Position Sensor 4 Circuit Calibration
C129F GMC — Brake Pedal Position Sensor 4 Circuit Calibration

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 Code

What does OBDII code C129F mean?

OBDII code C129F indicates a problem with the calibration of the Brake Pedal Position Sensor 4 circuit, which is crucial for proper brake system function.

What are the common symptoms of code C129F?

Common symptoms include warning lights on the dashboard, unusual brake behavior, and difficulty in applying or releasing the brakes.

What could cause the C129F code to trigger?

Causes may include a faulty brake pedal position sensor, poor electrical connections, damaged wiring, or issues with the brake control module.

How can I diagnose the issue related to code C129F?

To diagnose, inspect the brake pedal position sensor and its wiring for damage, check for proper voltage and ground at the connector, and use a scan tool to look for related codes.

What are some repair tips for fixing code C129F?

Repair tips include replacing a faulty brake pedal position sensor, ensuring all electrical connections are secure, and recalibrating the sensor if necessary.

Can I drive my vehicle with code C129F?

While it may be possible to drive, it is not recommended as it can affect brake performance and safety. Itâ€™s best to address the issue promptly.

Is it necessary to reset the code after repairs?

Yes, after making repairs, itâ€™s important to clear the code using an OBDII scanner and perform a test drive to ensure the issue is resolved.

How much does it typically cost to repair code C129F?

Repair costs can vary widely, ranging from $100 to $500 depending on whether you need to replace the sensor, repair wiring, or recalibrate the system.

Will clearing the code fix the problem permanently?

No, simply clearing the code will not fix the underlying issue. Proper diagnosis and repair of the brake pedal position sensor or circuit is necessary for a permanent solution.