AutoCodes – GMC – U2139 GMC

U2139 GMC Code - Lost Communication With Column Integration Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Column Integration Module, Column Integration Module harness is open or shorted, Column Integration 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: U2139 GMC indicates Lost Communication With Column Integration Module.
Common causes: Common causes include Faulty Column Integration Module, Column Integration Module harness is open or shorted, Column Integration 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 652

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 Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U2139 GMC Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2139 GMC - Lost Communication With Column Integration Module - AutoCodes.com — U2139 GMC Code - Lost Communication With Column Integration Module

What does this mean?

What are the Possible Causes of the DTC U2139 GMC?

Faulty Column Integration Module
Column Integration Module harness is open or shorted
Column Integration Module circuit poor electrical connection

How to Fix the DTC U2139 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 U2139 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.

Need more information about the U2139 GMC code?

Need more information on how to fix the U2139 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2139 GMC code diagnosed by a professional: Find a repair shop in your area

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 U2139 GMC Code

1. What does the OBDII code U2139 mean on a GMC?

It indicates a loss of communication with the Column Integration Module (CIM), which is responsible for controlling various vehicle functions like lighting and wiper systems.

2. What are the common symptoms of code U2139 on a GMC?

Symptoms may include a non-functioning horn, inoperative wipers, malfunctioning turn signals, or intermittent communication issues with other modules.

3. What causes the U2139 code to appear on a GMC vehicle?

Common causes include faulty wiring or connectors, a failing Column Integration Module, or intermittent power supply issues to the module.

4. Can a weak battery cause the U2139 code on a GMC?

Yes, a weak or failing battery, or poor battery connections, can cause communication errors and trigger the U2139 code.

5. How do you diagnose the U2139 code on a GMC?

Use a scan tool to check for related codes and inspect the wiring, connectors, and power supply to the Column Integration Module.

6. Can I drive my GMC with a U2139 code active?

While the vehicle may still be drivable, important systems like wipers and turn signals may not work, which can compromise safety.

7. How do you fix the U2139 code on a GMC?

Repairs may include fixing damaged wiring, cleaning or reconnecting loose connectors, updating the CIM software, or replacing the Column Integration Module if necessary.

8. Is the U2139 code specific to GMC vehicles?

No, the U2139 code can appear on other GM vehicles, but it is specific to issues with the Column Integration Module in those models.

9. What tools are needed to troubleshoot the U2139 code on a GMC?

A professional-grade scan tool and a multimeter are essential for diagnosing communication and wiring issues.

10. Can software updates resolve the U2139 code on a GMC?

Yes, in some cases, updating the software for the Column Integration Module or other related modules can resolve the issue.

Discuss the causes and fixes for U2139 GMC OBDII Code

Submit a New Comment

Code U2139 GMC comments

No comments found for this page.

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.