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Engine-Codes – Generic – U0138

U0138 Code - Lost Communication With All Terrain Control Module

Quick Answer

The U0138 diagnostic trouble code (DTC) indicates that there has been a loss of communication with the All Terrain Control Module (ATCM) in the vehicle. Common causes include Faulty wiring or connectors leading to the ATCM, Malfunctioning ATCM, Issues with the vehicle's network communication system. 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
U0138 indicates Lost Communication With All Terrain Control Module.
Common causes
Common causes include Faulty wiring or connectors leading to the ATCM, Malfunctioning ATCM, Issues with the vehicle's network communication system.
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 12, 2024
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Code U0138 Description

The U0138 diagnostic trouble code (DTC) indicates that there has been a loss of communication with the All Terrain Control Module (ATCM) in the vehicle. The ATCM is responsible for controlling various aspects of the vehicle's all-terrain capabilities, such as traction control, stability control, and other related functions. When communication with the ATCM is lost, it can have serious implications for the vehicle's performance and overall safety.

OBDII Code U0138 - Lost Communication With All Terrain Control Module
U0138 Code - Lost Communication With All Terrain Control Module

Common Causes of U0138

  1. Faulty wiring or connectors leading to the ATCM
  2. Malfunctioning ATCM
  3. Issues with the vehicle's network communication system
  4. Corrosion or water damage affecting the ATCM
  5. Electrical interference or disruptions affecting communication

Symptoms of U0138

  1. ABS and traction control lights illuminated on the dashboard
  2. Loss of traction control and stability control functions
  3. Erratic or unpredictable handling, especially in challenging driving conditions
  4. Vehicle going into limp mode to protect drivetrain

How to Fix U0138

  1. Perform a thorough diagnostic scan to retrieve the U0138 code and verify the loss of communication with the ATCM.
  2. Inspect the wiring harnesses and connectors related to the ATCM for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the ATCM for proper functionality and communication. Replace the module if it is found to be faulty.
  4. Check the vehicle's network communication system for any issues that may be affecting communication with the ATCM. Address and repair any faults.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved and that communication with the ATCM is restored.

Cost to Fix U0138

The typical repair costs for addressing the U0138 code can vary depending on the specific cause of the communication loss with the ATCM. In general, the cost of parts for this repair can range from $200 to $600, while labor costs can range from $100 to $300. Overall, the total cost for resolving the U0138 code may amount to approximately $300 to $900, including parts and labor.

Need more information about the U0138 code?

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Code U0138 Information for Specific Makes

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 U0138 Code

1. What are common symptoms of OBDII code U0138 (Lost Communication With All Terrain Control Module)?

- Common symptoms include the illumination of the Check Engine Light, traction control system malfunction, ABS system issues, and potentially rough shifting in automatic transmissions.

2. What are some possible causes of OBDII code U0138?

- Possible causes include a faulty All Terrain Control Module (ATCM), damaged wiring or connectors related to the ATCM, a blown fuse, software issues, or a communication bus fault.

3. How can I diagnose the cause of OBDII code U0138?

- To diagnose the cause, you can start by checking the wiring and connectors related to the ATCM for any visible damage. Using a scan tool to access the ATCM module for trouble codes and data can also help pinpoint the issue.

4. How can I repair OBDII code U0138?

- Repairing this code typically involves addressing the underlying cause, such as replacing a faulty ATCM, repairing damaged wiring or connectors, checking and replacing fuses as needed, or updating software if necessary.

5. Can I continue driving with OBDII code U0138 present?

- It is not recommended to continue driving with this code present, as it can lead to further issues with the traction control and ABS systems, affecting the vehicle's safety and performance.

6. Is it possible to reset OBDII code U0138 without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the underlying problem causing the communication loss to prevent the code from reoccurring and ensure proper functioning of the ATCM.

7. How do I prevent OBDII code U0138 from coming back?

- Regular maintenance checks, addressing any wiring or connector issues promptly, ensuring proper software updates for the ATCM, and following manufacturer recommendations can help prevent the recurrence of this code.

8. Can a DIY enthusiast repair OBDII code U0138, or is it best left to professionals?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to address this code by following diagnostic procedures and repair steps outlined in the vehicle's service manual. However, complex wiring or module replacement may require professional assistance.

9. How long does it typically take to repair OBDII code U0138?

- The repair time can vary based on the underlying cause and the complexity of the repair needed. Simple fixes like replacing a fuse or clearing a communication fault may take a short time, while diagnosing and replacing a faulty ATCM could take longer.

10. Does OBDII code U0138 affect vehicle performance?

- Yes, this code can affect vehicle performance by causing issues with the traction control system, ABS system, and potentially impacting overall drivability and safety. Addressing the code promptly is crucial to maintaining optimal performance.

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