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Engine-Codes – Generic – U0128

U0128 Code - Lost Communication With Park Brake Control Module

Quick Answer

The U0128 code indicates that there is a communication issue between the vehicle's engine control module (ECM) and the park brake control module. Common causes include Faulty wiring or connectors between ECM and park brake control module, Defective park brake control module, ECM malfunction. 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 indicates Lost Communication With Park Brake Control Module.
Common causes
Common causes include Faulty wiring or connectors between ECM and park brake control module, Defective park brake control module, ECM malfunction.
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 07, 2024
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Code U0128 Description

The U0128 code indicates that there is a communication issue 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 modern vehicles. When communication is lost between the ECM and the park brake control module, it can lead to various issues with the electronic parking brake system, potentially affecting the vehicle's performance and safety.

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

Common Causes of U0128

  1. Faulty wiring or connectors between ECM and park brake control module
  2. Defective park brake control module
  3. ECM malfunction
  4. Corrosion or damage to communication bus
  5. Software issues with either module

Symptoms of U0128

  1. Electronic parking brake not engaging or disengaging properly
  2. Warning light on the dashboard related to the electronic parking brake system
  3. Loss of communication with other vehicle systems
  4. Reduced performance or drivability issues

How to Fix U0128

  1. Begin by checking the wiring and connectors between the ECM and park brake control module for any damage or corrosion. Repair or replace as necessary.
  2. Inspect the park brake control module and ECM for any signs of malfunction. Replace any faulty modules.
  3. Clear the diagnostic trouble codes and reset the system to see if the communication issue is resolved.
  4. Perform a software update on both modules to ensure they are running the latest version.
  5. Test drive the vehicle to verify that the communication between the modules has been restored and that the electronic parking brake system functions correctly.

Cost to Fix U0128

The cost of repairing a U0128 code can vary depending on the specific cause of the communication issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. Keep in mind that this is just an estimate, and the final cost may be higher or lower based on the extent of the repair needed. It's recommended to consult with a professional mechanic to get a more accurate quote for your particular vehicle.

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Code U0128 Information for Specific Makes

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 Code

What does the OBDII code U0128 mean?

1. U0128 indicates that the vehicle’s main control modules have lost communication with the Park Brake Control Module (PBCM). 2.

What are common symptoms of the U0128 code?

Symptoms can include the parking brake not engaging or releasing, warning lights on the dashboard, and potential loss of electronic brake functionality. 3.

What causes the U0128 code to appear?

Common causes include a faulty Park Brake Control Module, damaged wiring or connectors, software glitches, or a weak battery. 4.

Can driving with the U0128 code damage my car?

While driving may still be possible, the parking brake system may not function correctly, which could pose safety risks, especially on steep inclines. 5.

How do I diagnose the U0128 code?

Start by checking for loose or corroded wiring and connectors near the parking brake system. If no visible damage is found, use a scan tool to test the PBCM and related circuits. 6.

Can low battery voltage trigger the U0128 code?

Yes, low or unstable battery voltage can interrupt communication with the Park Brake Control Module and cause the code to set. 7.

How is the U0128 code fixed?

Repairs may include replacing or repairing damaged wiring, cleaning corroded connectors, updating the module’s software, or replacing the Park Brake Control Module if it’s defective. 8.

What tools are needed to troubleshoot the U0128 code?

A scan tool capable of reading manufacturer-specific codes, a multimeter for checking circuits, and possibly a wiring diagram for the Park Brake Control Module system. 9.

Does the U0128 code always mean the Park Brake Control Module is bad?

No, the issue could also stem from wiring problems, connector corrosion, or communication errors in other related modules. 10.

How much does it cost to repair the U0128 code?

Repair costs vary depending on the cause. Fixing wiring issues may cost $100-$200, while replacing the Park Brake Control Module could cost $500-$1,000 or more, including labor.

Discuss the causes and fixes for U0128 OBDII Code

Submit a New Comment

  • Hello
    I have a Land Rover Discovery-05.
    It has error code U0128 and the parking brake light lights up orange all the time. The parking brake does not work at all, not a noise.
    The insurance is complete and there is electricity on it. There is a power on 2 pins of a red and one green white cable on the connector at the module underneath the car. It landed on 2 black cables there. Have checked all the cables that are under the car. Did not find the error?

    Reply to Comment