AutoCodes – GMC – U0139 GMC

U0139 GMC 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 GMC 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 2,036

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

What does this mean?

What are the Possible Causes of the DTC U0139 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are common symptoms of OBDII code U0139 GMC (Lost Communication With Suspension Control Module)?

- Common symptoms include illuminated dashboard warning lights, suspension issues, and difficulty controlling the vehicle's ride height.

2. What are possible causes of code U0139 indicating lost communication with the suspension control module?

- Possible causes include wiring issues, a faulty suspension control module, a defective CAN bus network, or a problem with the power supply to the module.

3. How can I diagnose OBDII code U0139 related to the suspension control module?

- Diagnose the code by checking the suspension control module for power and ground, inspecting the wiring for damage, and using a diagnostic scanner to retrieve specific error codes.

4. What are some general repair tips for fixing the U0139 code related to the suspension control module?

- Repair tips include checking and repairing any damaged wiring, ensuring proper power supply to the module, and resetting the code after addressing any underlying issues.

5. Can I drive my vehicle with the U0139 code indicating lost communication with the suspension control module?

- It is generally not recommended to drive the vehicle with this code present, as it can affect the performance and safety of the suspension system.

6. How much does it typically cost to repair OBDII code U0139 GMC (Lost Communication With Suspension Control Module)?

- Repair costs can vary depending on the specific issue causing the code, but they may range from $100 to $500 or more, including parts and labor.

7. Is it possible to reset the U0139 code related to the suspension control module without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause of the communication loss is addressed and repaired.

8. Can a DIY enthusiast fix the U0139 code indicating lost communication with the suspension control module?

- Depending on the specific issue, a DIY enthusiast with automotive repair experience may be able to diagnose and repair the problem, such as checking wiring connections or replacing a module.

9. How urgent is it to address OBDII code U0139 GMC (Lost Communication With Suspension Control Module)?

- It is recommended to address this code promptly to prevent further damage to the suspension system and ensure the overall safety and performance of the vehicle.

10. Are there any recalls or technical service bulletins related to OBDII code U0139 GMC?

- It is advisable to check with the manufacturer, dealership, or online databases for any recalls or technical service bulletins related to this specific OBDII code and affected vehicles.