AutoCodes – Cadillac – U2139 Cadillac

U2139 Cadillac 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 Cadillac 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.

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Code Popularity 716

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2139 Cadillac 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 Cadillac - Lost Communication With Column Integration Module - AutoCodes.com — U2139 Cadillac Code - Lost Communication With Column Integration Module

What does this mean?

What are the Possible Causes of the DTC U2139 Cadillac?

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 Cadillac?

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 Cadillac 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 U2139 Cadillac Code

What does the OBDII code U2139 mean for a Cadillac?

The U2139 code indicates a lost communication with the Column Integration Module (CIM), meaning the engine control module (ECM) cannot communicate with the CIM.

What are the common symptoms associated with the U2139 code?

Common symptoms include malfunctioning steering wheel controls, issues with the airbag system, problems with the ignition switch, and warning lights on the dashboard.

What causes the U2139 code to trigger?

The code can be triggered by a faulty Column Integration Module, damaged wiring or connectors, poor electrical connections, or issues with the vehicle's battery or power supply.

How can I diagnose the U2139 code?

Start by using an OBDII scanner to confirm the code and check for related codes. Inspect the wiring and connectors related to the CIM, and test the CIM itself for functionality.

What are some repair tips for resolving the U2139 code?

Check and repair any damaged wiring or connectors, ensure proper grounding, replace the CIM if it is faulty, and clear the codes to see if they return after repairs.

Can I drive my Cadillac with the U2139 code?

While you can drive the vehicle, it may have compromised functionality, especially with steering and safety features, so it's advisable to address the issue as soon as possible.

Is the U2139 code specific to certain Cadillac models?

The U2139 code can occur in various Cadillac models, especially those equipped with advanced electronic systems, but it is not exclusive to a particular model.

How much does it typically cost to repair the U2139 code?

Repair costs can vary widely, depending on the cause. Simple wiring repairs might cost less than $100, while a new Column Integration Module can range from $200 to $600 or more, plus labor.

Will clearing the code fix the problem?

Clearing the code may temporarily turn off the warning lights, but if the underlying issue is not resolved, the code will likely return.