AutoCodes – Buick – U0139 Buick

U0139 Buick Code - Lost Communication With Suspension 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 Suspension Control Module, Suspension Control Module harness is open or shorted, Suspension 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: U0139 Buick indicates Lost Communication With Suspension Control Module.
Common causes: Common causes include Faulty Suspension Control Module, Suspension Control Module harness is open or shorted, Suspension 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 578

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 U0139 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 Suspension Control Module has not been received.

OBDII Code U0139 Buick - Lost Communication With Suspension Control Module - AutoCodes.com — U0139 Buick Code - Lost Communication With Suspension Control Module

What does this mean?

What are the Possible Causes of the DTC U0139 Buick?

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

How to Fix the DTC U0139 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 U0139 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 U0139 Buick Code

1. What are the common symptoms of OBDII code U0139 in a Buick related to the suspension control module?

- Common symptoms include the suspension system not responding properly, a warning light on the dashboard, and potential issues with ride comfort.

2. What are some possible causes for the U0139 code indicating lost communication with the suspension control module in a Buick?

- Potential causes include a faulty suspension control module, damaged wiring or connectors, a software glitch, or electronic communication issues.

3. How can I diagnose the U0139 code in my Buick related to the suspension control module?

- Diagnosing the issue involves using an OBDII scanner to read the code, checking the wiring and connectors for signs of damage, and testing the suspension control module for proper functionality.

4. Can driving with the U0139 code present in a Buick cause further damage?

- It is advisable to address the issue promptly to avoid potential damage to other components of the suspension system and ensure optimal vehicle performance and safety.

5. What are some repair tips for resolving the U0139 code in a Buick indicating lost communication with the suspension control module?

- Repair tips include checking and repairing any damaged wiring or connectors, ensuring the suspension control module is functioning correctly, and resetting the system after repairs.

6. Is it possible to reset the U0139 code in a Buick without repairing the issue with the suspension control module?

- While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue with the suspension control module to prevent further problems.

7. Can a DIY enthusiast without advanced automotive knowledge fix the U0139 code related to the suspension control module in a Buick?

- Depending on the specific issue, DIY enthusiasts with some automotive experience may be able to address simple causes like loose connections, but complex issues may require professional diagnosis and repair.

8. How much does it typically cost to repair the U0139 code indicating lost communication with the suspension control module in a Buick?

- Repair costs can vary based on the underlying cause, but expenses may include parts replacement, labor charges, and diagnostic fees, ranging from a few hundred to over a thousand dollars.

9. Are there any recalls or technical service bulletins related to the U0139 code in Buick vehicles?

- It is advisable to check with Buick dealerships or online resources for any recalls or technical service bulletins related to the U0139 code to see if the issue is covered under warranty or a known manufacturing defect.

10. How can I prevent the U0139 code from reoccurring in my Buick after repair?

- To prevent the code from reoccurring, ensure proper installation of any replacement parts, conduct regular maintenance checks on the suspension system, and address any related issues promptly to maintain optimal vehicle performance.