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Engine-Codes – GMC – C129E GMC

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

Quick Answer

The C129E GMC code indicates a problem with the Brake Pedal Position Sensor 4 Circuit, specifically a high input signal. Common causes include Faulty brake pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections. 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 GMC indicates Brake Pedal Position Sensor 4 Circuit High Input.
Common causes
Common causes include Faulty brake pedal position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or contamination in the sensor connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code C129E GMC Description

The C129E GMC code indicates a problem with the Brake Pedal Position Sensor 4 Circuit, specifically a high input signal. The brake pedal position sensor is a crucial component of the vehicle's braking system, as it detects the position of the brake pedal and sends this information to the vehicle's electronic control unit (ECU). This allows the ECU to determine when and how much to apply the brakes, ensuring safe and efficient braking performance.

OBDII Code C129E GMC - Brake Pedal Position Sensor 4 Circuit High Input
C129E GMC Code - Brake Pedal Position Sensor 4 Circuit High Input

Common Causes of C129E GMC

  1. Faulty brake pedal position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or contamination in the sensor connections
  4. Issues with the ECU or ABS module
  5. Electrical interference or short circuits in the sensor circuit

Symptoms of C129E GMC

  1. Illumination of the brake warning light on the dashboard
  2. Erratic or unresponsive braking behavior
  3. ABS system engaging unexpectedly
  4. Difficulty in engaging or disengaging the brakes
  5. Loss of power assist in the braking system

How to Fix C129E GMC

  1. Begin by conducting a thorough inspection of the brake pedal position sensor and its wiring harness to check for any visible damage or corrosion.
  2. Use a multimeter to test the sensor's resistance and voltage output to determine if it is functioning within the specified range.
  3. If the sensor is faulty, replace it with a new, OEM-approved sensor to ensure proper functionality.
  4. Clear the diagnostic trouble codes from the vehicle's ECU using a scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the ABS module or ECU that may be causing the high input signal.

Cost to Fix C129E GMC

The typical repair costs for addressing a C129E GMC code related to the Brake Pedal Position Sensor 4 Circuit High Input can vary depending on the specific vehicle make and model, as well as the labor rates in different locations. On average, the parts cost for a new brake pedal position sensor can range from $50 to $150, while the labor cost for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall within the range of $150 to $450. It is advisable to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on the specific circumstances of the vehicle in question.

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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 GMC Code

1. What are the common symptoms of OBDII code C129E in a GMC vehicle?

The common symptoms of OBDII code C129E in a GMC vehicle include issues with the brake pedal position sensor, such as erratic or non-responsive brake pedal behavior.

2. What does the OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input mean in a GMC vehicle?

The OBDII code C129E indicates that there is a high input detected in the circuit related to Brake Pedal Position Sensor 4 in a GMC vehicle.

3. What are the possible causes of OBDII code C129E in a GMC vehicle?

Possible causes of OBDII code C129E in a GMC vehicle include a faulty brake pedal position sensor, damaged wiring or connectors, or issues with the brake pedal position sensor circuit.

4. How can I diagnose the OBDII code C129E related to the Brake Pedal Position Sensor in my GMC vehicle?

To diagnose the OBDII code C129E related to the Brake Pedal Position Sensor in a GMC vehicle, you can use an OBDII scanner to read the trouble codes, inspect the brake pedal position sensor and its wiring, and perform a circuit test to identify the issue.

5. Can I still drive my GMC vehicle with OBDII code C129E present?

It is not recommended to drive your GMC vehicle with OBDII code C129E present, as it indicates a potential issue with the brake pedal position sensor that can affect braking performance and safety.

6. How do I repair OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input in my GMC vehicle?

To repair OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input in a GMC vehicle, you may need to replace the faulty brake pedal position sensor, repair damaged wiring or connectors, or reset the sensor calibration.

7. Is it possible to reset the OBDII code C129E in a GMC vehicle without fixing the underlying issue?

While you can clear the OBDII code C129E in a GMC vehicle using an OBDII scanner, it is important to address the underlying issue with the brake pedal position sensor to prevent the code from reoccurring.

8. Can a DIY enthusiast fix the OBDII code C129E related to the Brake Pedal Position Sensor in a GMC vehicle?

Depending on the level of expertise and access to tools, a DIY enthusiast may be able to fix the OBDII code C129E related to the Brake Pedal Position Sensor in a GMC vehicle by following repair guides and tutorials.

9. How much does it typically cost to repair OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input in a GMC vehicle?

The cost to repair OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input in a GMC vehicle can vary depending on the extent of the issue, the parts needed for replacement, and whether you choose to do the repair yourself or seek professional help.

10. Will OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input cause the GMC vehicle to fail an emissions test?

OBDII code C129E Brake Pedal Position Sensor 4 Circuit High Input may not directly cause the GMC vehicle to fail an emissions test, but it is still important to address the issue promptly to ensure the vehicle's overall performance and safety.

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