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Engine-Codes – GMC – U0128 GMC

U0128 GMC Code - Lost Communication With Park Brake Control Module

Quick Answer

The U0128 diagnostic trouble code (DTC) for GMC vehicles indicates that there has been a communication failure between the vehicle's engine control module (ECM) and the park brake control module. Common causes include Faulty park brake control module, Wiring issues or loose connections between the ECM and park brake control module, Electronic interference affecting communication between modules. 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
U0128 GMC indicates Lost Communication With Park Brake Control Module.
Common causes
Common causes include Faulty park brake control module, Wiring issues or loose connections between the ECM and park brake control module, Electronic interference affecting communication between modules.
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 U0128 GMC Description

The U0128 diagnostic trouble code (DTC) for GMC vehicles indicates that there has been a communication failure between the vehicle's engine control module (ECM) and the park brake control module. The park brake control module is responsible for managing the electronic parking brake system in the vehicle. When communication is lost between these two modules, it can lead to issues with the proper functioning of the electronic parking brake system.

OBDII Code U0128 GMC - Lost Communication With Park Brake Control Module
U0128 GMC Code - Lost Communication With Park Brake Control Module

Common Causes of U0128 GMC

  1. Faulty park brake control module.
  2. Wiring issues or loose connections between the ECM and park brake control module.
  3. Electronic interference affecting communication between modules.
  4. Software glitches or malfunctions within the ECM or park brake control module.
  5. Electrical system issues within the vehicle.

Symptoms of U0128 GMC

  1. Electronic parking brake not engaging or disengaging properly.
  2. Warning light for electronic parking brake system illuminated on the dashboard.
  3. Loss of functionality in the electronic parking brake system.
  4. Limited control over the electronic parking brake system.

How to Fix U0128 GMC

  1. Begin by conducting a thorough inspection of the wiring and connections between the ECM and park brake control module to check for any loose connections or damage.
  2. Use a diagnostic scanner to reset the communication between the modules and clear the U0128 DTC from the vehicle's system.
  3. If the issue persists, consider replacing the park brake control module with a new one to ensure proper communication with the ECM.
  4. Test the electronic parking brake system to verify that the communication between modules has been restored and that the system functions correctly.
  5. Finally, clear the DTC from the vehicle's system and perform a test drive to confirm that the electronic parking brake system operates as intended.

Cost to Fix U0128 GMC

The typical repair costs for addressing the U0128 DTC can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty park brake control module can range from $200 to $500, including parts and labor. However, additional costs may apply if there are wiring issues or other underlying problems contributing to the communication failure. It's recommended to consult with a professional mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model, as well as the local labor rates in your area.

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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 U0128 GMC Code

1. What are the common symptoms of U0128 GMC code?

- Common symptoms include the parking brake warning light being illuminated on the dashboard, limited functionality of the parking brake system, and potential issues with the stability control system.

2. What can cause the U0128 GMC code to occur?

- The U0128 code usually indicates a communication problem between the vehicle's onboard computer and the Park Brake Control Module. This can be caused by damaged wiring, a faulty control module, or a poor connection.

3. How can I diagnose the U0128 GMC code?

- Diagnosing the U0128 code typically involves using a diagnostic scanner to retrieve the specific fault codes stored in the vehicle's computer. Further testing may be required to pinpoint the exact cause of the communication failure.

4. Can the U0128 GMC code be fixed at home?

- While some basic troubleshooting steps like checking for loose connections or damaged wiring can be done at home, resolving the U0128 code often requires specialized equipment and expertise. It is recommended to seek assistance from a qualified mechanic.

5. Is it safe to drive with the U0128 GMC code present?

- Driving with the U0128 code may lead to issues with the parking brake system and stability control, affecting the overall safety and performance of the vehicle. It is advisable to address the problem promptly to avoid potential safety risks.

6. How much does it typically cost to repair the U0128 GMC code?

- The cost of repairing the U0128 code can vary depending on the underlying cause of the communication failure and the labor rates in your area. It is recommended to obtain quotes from multiple repair shops for an accurate estimate.

7. Can resetting the U0128 GMC code make it go away permanently?

- Resetting the U0128 code may temporarily clear the fault code, but if the root cause of the communication issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the underlying problem to prevent future occurrences.

8. Are there any common tricks to try before taking the vehicle to a mechanic for the U0128 GMC code?

- Checking the parking brake system for any obvious issues, ensuring all connections are secure, and resetting the vehicle's computer by disconnecting the battery for a few minutes are some common tricks to try before seeking professional help.

9. Can extreme weather conditions trigger the U0128 GMC code?

- Extreme weather conditions, such as heavy rain or extreme cold, can potentially affect the electrical connections and components involved in the communication between the vehicle's computer and the Park Brake Control Module, leading to the U0128 code.

10. How long does it typically take to repair the U0128 GMC code?

- The repair time for the U0128 code can vary depending on the exact cause of the communication failure and the availability of parts. In some cases, the repair may be completed within a few hours, while more complex issues may require additional time for diagnosis and repair.

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