AutoCodes – GMC – U2138 GMC

U2138 GMC Code - Lost Communication With Steering Column Lock Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Steering Column Lock Control Module (SCLCM), Steering Column Lock Control Module harness is open or shorted, Steering Column Lock 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: U2138 GMC indicates Lost Communication With Steering Column Lock Control Module.
Common causes: Common causes include Faulty Steering Column Lock Control Module (SCLCM), Steering Column Lock Control Module harness is open or shorted, Steering Column Lock 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 585

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
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Code U2138 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 U2138 GMC - Lost Communication With Steering Column Lock Control Module - AutoCodes.com — U2138 GMC Code - Lost Communication With Steering Column Lock Control Module

What does this mean?

What are the Possible Causes of the DTC U2138 GMC?

Faulty Steering Column Lock Control Module (SCLCM)
Steering Column Lock Control Module harness is open or shorted
Steering Column Lock Control Module circuit poor electrical connection

How to Fix the DTC U2138 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 U2138 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 U2138 GMC Code

1. What are the common symptoms of OBDII code U2138 GMC?

- Common symptoms include difficulty starting the vehicle, steering wheel locking or becoming hard to turn, warning lights on the dashboard, and loss of power steering assistance.

2. What can cause the U2138 GMC code to trigger?

- The code U2138 is typically triggered when there is a communication failure between the steering column lock control module and other vehicle modules, such as the body control module or the powertrain control module.

3. How serious is the U2138 GMC code?

- The U2138 code can impact the functionality of the steering column lock control module, which is essential for steering and vehicle security systems. It is important to address this issue promptly to ensure safe operation of the vehicle.

4. Can I still drive my vehicle with the U2138 GMC code present?

- It is not recommended to drive the vehicle with the U2138 code present, especially if you are experiencing symptoms like steering wheel locking or difficulty turning. Continued driving may pose safety risks and lead to further damage.

5. How can I diagnose the U2138 GMC code?

- Diagnosing the U2138 code typically involves using a professional OBDII scanner to retrieve the trouble codes, checking for any related codes stored in other modules, and conducting a thorough inspection of the steering column lock control module and associated wiring.

6. What are some possible repair tips for the U2138 GMC code?

- Repair tips may include checking and repairing any damaged wiring or connectors, resetting the steering angle sensor, reprogramming the steering column lock control module, or replacing the module altogether if necessary.

7. Will resetting the trouble codes make the U2138 GMC code go away permanently?

- Resetting the trouble codes may temporarily clear the U2138 code, but if the underlying issue causing the communication failure is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem.

8. Can a DIY enthusiast fix the U2138 GMC code, or is professional assistance recommended?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U2138 code may require specialized tools and expertise. It is advisable to seek professional assistance for a comprehensive solution.

9. How much does it typically cost to repair the U2138 GMC code?

- The cost of repairing the U2138 code can vary depending on the root cause of the issue, the necessary repairs or replacements, and labor costs. It is recommended to obtain estimates from qualified technicians or repair shops.

10. Are there any recalls or technical service bulletins related to the U2138 GMC code?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to the U2138 code, as they may provide valuable information or solutions for the issue.