AutoCodes – Buick – U0128 Buick

U0128 Buick Code - Lost Communication With Park Brake Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Park Brake Control Module, Park Brake Control Module harness is open or shorted, Park Brake Control Module 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: U0128 Buick indicates Lost Communication With Park Brake Control Module.
Common causes: Common causes include Faulty Park Brake Control Module, Park Brake Control Module harness is open or shorted, Park Brake Control Module 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 3,444

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0128 Buick Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Park Brake Control Module has not been received.

OBDII Code U0128 Buick - Lost Communication With Park Brake Control Module - AutoCodes.com — U0128 Buick Code - Lost Communication With Park Brake Control Module

What does this mean?

What are the Possible Causes of the DTC U0128 Buick?

Faulty Park Brake Control Module
Park Brake Control Module harness is open or shorted
Park Brake Control Module circuit poor electrical connection

How to Fix the DTC U0128 Buick?

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 U0128 Buick 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 U0128 Buick Code

1. What are the common symptoms of OBDII code U0128 in a Buick related to the Park Brake Control Module?

When this code is present, you may experience issues with the electronic parking brake system, such as the parking brake not engaging or releasing properly.

2. What are some possible causes of the U0128 code indicating a lost communication with the Park Brake Control Module in a Buick?

Possible causes include a faulty Park Brake Control Module, damaged wiring or connectors, or a communication error within the vehicle's network.

3. How can I diagnose the U0128 code in my Buick related to the Park Brake Control Module?

To diagnose this code, you may need to perform a thorough inspection of the Park Brake Control Module, check the wiring and connectors for any damage, and use a diagnostic scan tool to communicate with the module.

4. Can I continue to drive my Buick with the U0128 code related to the Park Brake Control Module?

It is not recommended to continue driving the vehicle with this code present, as it may affect the functionality of the electronic parking brake system and compromise safety.

5. How can I reset the U0128 code in my Buick after repairing the issue with the Park Brake Control Module?

After repairing the underlying issue, you can reset the code using a diagnostic scan tool capable of clearing fault codes from the vehicle's system.

6. Are there any DIY repair tips for addressing the U0128 code in a Buick related to the Park Brake Control Module?

While some basic inspections and checks can be done by DIY enthusiasts, diagnosing and repairing this code may require advanced technical knowledge and specialized equipment, so it's recommended to consult a professional mechanic.

7. How much does it typically cost to repair the U0128 code indicating a lost communication with the Park Brake Control Module in a Buick?

The cost of repairing this code can vary depending on the specific issue causing the communication loss, but it may involve replacing the Park Brake Control Module or repairing damaged wiring, which could range from a few hundred to over a thousand dollars.

8. Can extreme weather conditions or environmental factors trigger the U0128 code in a Buick related to the Park Brake Control Module?

Yes, extreme temperature changes, moisture, or other environmental factors can sometimes lead to communication errors with the Park Brake Control Module, triggering the U0128 code.

9. Will the U0128 code related to the Park Brake Control Module cause my Buick to fail an emissions test?

The U0128 code is related to a communication error with the Park Brake Control Module and is not directly linked to emissions, so it should not cause your Buick to fail an emissions test.

10. How long does it typically take to repair the U0128 code indicating a lost communication with the Park Brake Control Module in a Buick?

The repair time can vary depending on the specific cause of the code and the availability of parts, but it may take a few hours to a full day for a mechanic to diagnose and fix the issue.