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U18B6 GMC Code - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus

Quick Answer

The U18B6 GMC code indicates that the vehicle's onboard computer has lost communication with the Active Safety Control Module 1 on the Chassis Expansion CAN Bus. Common causes include Damaged wiring or connectors leading to the Active Safety Control Module, A faulty Active Safety Control Module, Malfunctioning CAN Bus 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
U18B6 GMC indicates Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus.
Common causes
Common causes include Damaged wiring or connectors leading to the Active Safety Control Module, A faulty Active Safety Control Module, Malfunctioning CAN Bus 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 10, 2024
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Code U18B6 GMC Description

The U18B6 GMC code indicates that the vehicle's onboard computer has lost communication with the Active Safety Control Module 1 on the Chassis Expansion CAN Bus. The Active Safety Control Module is responsible for monitoring and controlling various safety systems in the vehicle, such as traction control, stability control, and active braking systems. When communication is lost with this module, it can lead to a loss of functionality in these safety systems, potentially compromising the vehicle's safety and performance.

OBDII Code U18B6 GMC - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus
U18B6 GMC Code - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus

Common Causes of U18B6 GMC

  1. Damaged wiring or connectors leading to the Active Safety Control Module.
  2. A faulty Active Safety Control Module.
  3. Malfunctioning CAN Bus system.
  4. Software glitch in the vehicle's onboard computer.
  5. Corrosion or moisture in the electrical connections.

Symptoms of U18B6 GMC

  1. Illumination of the traction control or stability control warning light on the dashboard.
  2. Loss of traction control or stability control functionality.
  3. Erratic braking behavior, such as unexpected activation of the ABS system.
  4. Difficulty engaging or disengaging cruise control.
  5. Issues with other safety-related systems, such as lane departure warning or collision avoidance.

How to Fix U18B6 GMC

  1. Perform a thorough inspection of the wiring and connectors related to the Active Safety Control Module.
  2. Test the Active Safety Control Module for functionality and replace if necessary.
  3. Check the CAN Bus system for any faults or malfunctions and repair as needed.
  4. Update the vehicle's software to address any glitches or communication issues.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure proper functionality of the safety systems.

Cost to Fix U18B6 GMC

The typical repair costs for resolving the U18B6 GMC code can vary depending on the specific cause of the issue. In general, replacing a faulty Active Safety Control Module can cost between $500 and $1000, including parts and labor. Repairing damaged wiring or connectors may range from $100 to $300, while addressing CAN Bus system issues can cost around $200 to $500. Software updates are usually included in the diagnostic labor charges, which can vary from $80 to $150 per hour at most auto repair shops. It's recommended to consult with a professional technician to get an accurate cost estimate based on the specific diagnosis and repair needs of the vehicle.

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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 U18B6 GMC Code

1. What are the common symptoms of OBDII code U18B6 GMC?

- Common symptoms include the illumination of the check engine light, loss of communication with active safety control module 1, and potential issues with safety systems.

2. What causes the OBDII code U18B6 GMC to appear?

- The code is typically triggered when there is a communication error between the vehicle's chassis expansion CAN bus and the active safety control module 1.

3. How can I diagnose the issue related to code U18B6 GMC?

- Diagnosis involves using a diagnostic scan tool to check for trouble codes, inspecting the wiring and connectors for any damage, and verifying the communication signals between modules.

4. What are some potential repair tips for resolving code U18B6 GMC?

- Repair tips may include repairing or replacing damaged wiring or connectors, resetting the fault codes after fixing the issue, and ensuring proper communication between modules.

5. Can the OBDII code U18B6 GMC be fixed without professional help?

- While some DIY enthusiasts may be able to address the issue by checking and repairing wiring connections, it is recommended to seek professional help for accurate diagnosis and repair.

6. Is it safe to continue driving with the U18B6 GMC trouble code present?

- It is not recommended to continue driving with the code active, as it may lead to potential safety system malfunctions and compromise vehicle performance.

7. Will resetting the trouble code make it go away permanently?

- Resetting the code without addressing the underlying issue may temporarily turn off the check engine light, but the code is likely to reappear if the communication problem persists.

8. How can I prevent the U18B6 GMC trouble code from reoccurring?

- Regularly inspecting and maintaining the vehicle's wiring harness, connectors, and communication networks can help prevent the code from reoccurring in the future.

9. Are there any recalls or technical service bulletins related to code U18B6 GMC?

- It is recommended to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to the specific OBDII trouble code.

10. What is the typical cost of repairing the U18B6 GMC trouble code?

- The cost of repairing the code can vary depending on the extent of the issue, parts needed for replacement, and labor charges from a professional technician.

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