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Engine-Codes – GMC – U2138 GMC

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

Quick Answer

The U2138 GMC code indicates that there is a communication error between the vehicle's onboard computer system and the Steering Column Lock Control Module. Common causes include Faulty Steering Column Lock Control Module, Wiring issues or loose connections, Communication error between modules. 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, Wiring issues or loose connections, Communication error between modules.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code U2138 GMC Description

The U2138 GMC code indicates that there is a communication error between the vehicle's onboard computer system and the Steering Column Lock Control Module. This module is responsible for controlling the steering column lock mechanism, which is a security feature designed to prevent the steering wheel from being turned without the key in the ignition. When communication is lost with this module, it can lead to issues with starting the vehicle, steering wheel lock malfunctions, and potentially compromising the vehicle's security system.

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

Common Causes of U2138 GMC

  1. Faulty Steering Column Lock Control Module
  2. Wiring issues or loose connections
  3. Communication error between modules
  4. Malfunctioning onboard computer system
  5. Electrical interference or corrosion in the system

Symptoms of U2138 GMC

  1. Steering wheel lock engaged or difficult to turn
  2. Vehicle not starting or going into a "no crank" condition
  3. Warning light on the dashboard related to the steering system
  4. Loss of power steering assistance
  5. Inability to shift out of park

How to Fix U2138 GMC

  1. Diagnose the specific cause of the communication error by using a diagnostic scanner to retrieve the fault codes and perform a thorough inspection of the wiring and connections.
  2. Replace the faulty Steering Column Lock Control Module if necessary.
  3. Repair any damaged wiring or connections in the system.
  4. Reset the onboard computer system and perform a relearn procedure to ensure proper communication between modules.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the steering column lock functions correctly.

Cost to Fix U2138 GMC

The typical repair costs for addressing a U2138 GMC code can vary depending on the specific cause of the issue. In general, replacing a faulty Steering Column Lock Control Module can range from $200 to $500, including parts and labor. However, additional costs may apply if there are wiring repairs or other components that need attention. It is advisable to consult with a professional mechanic to get an accurate estimate based on the vehicle's make and model, as well as the extent of the repairs needed. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to inquire about these factors when seeking repair services.

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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.

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