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C129E Cadillac 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 Cadillac 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.

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Code Popularity 753

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 C129E Cadillac 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 Cadillac - Brake Pedal Position Sensor 4 Circuit High Input - AutoCodes.com — C129E Cadillac Code - Brake Pedal Position Sensor 4 Circuit High Input

What does this mean?

What are the Possible Causes of the DTC C129E Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

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

- The common symptoms include the brake lights staying on continuously, the inability to shift out of park, and potential issues with the vehicle's stability control system.

2. What could cause the Brake Pedal Position Sensor 4 Circuit High Input error code (C129E) in a Cadillac?

- The error code C129E may 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 Brake Pedal Position Sensor 4 Circuit High Input error code in my Cadillac?

- You can diagnose the issue by performing a visual inspection of the brake pedal position sensor and its wiring, using an OBDII scanner to retrieve the specific error code, and testing the sensor's voltage and signal.

4. Is it safe to drive my Cadillac with the C129E error code related to the Brake Pedal Position Sensor 4 Circuit High Input?

- It is not recommended to drive the vehicle with this error code as it can affect the proper operation of the brake system and compromise your safety while driving.

5. Can I reset the C129E error code in my Cadillac related to the Brake Pedal Position Sensor 4 Circuit High Input?

- While you can clear the error code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

6. How can I repair the Brake Pedal Position Sensor 4 Circuit High Input error code in my Cadillac?

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

7. Will the C129E error code in my Cadillac go away on its own?

- The error code is unlikely to go away on its own and should be investigated and repaired promptly to avoid potential safety hazards and further damage to the vehicle.

8. Can a DIY enthusiast fix the Brake Pedal Position Sensor 4 Circuit High Input error code in a Cadillac?

- Depending on your experience and knowledge, you may be able to address the issue yourself by following repair guides and using the necessary tools. However, if you are unsure, it is best to seek professional help.

9. How much does it cost to repair the C129E error code in a Cadillac related to the Brake Pedal Position Sensor 4 Circuit High Input?

- The cost of repair can vary depending on the exact cause of the issue, the model of Cadillac, and whether you choose to do the repairs yourself or take the vehicle to a mechanic.

10. Can a faulty Brake Pedal Position Sensor 4 Circuit High Input cause other issues in my Cadillac?

- Yes, a faulty sensor can lead to various issues such as improper brake light operation, difficulty shifting gears, and potential problems with the vehicle's stability control system.