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Engine-Codes – GMC – U18B7 GMC

U18B7 GMC Code - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

Quick Answer

The U18B7 GMC code indicates that there is a communication issue with the Active Safety Control Module 2 on the Chassis Expansion CAN Bus. Common causes include Faulty Active Safety Control Module 2, Wiring or connector issues in the communication network, Software malfunction within the 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
U18B7 GMC indicates Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus.
Common causes
Common causes include Faulty Active Safety Control Module 2, Wiring or connector issues in the communication network, Software malfunction within the 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 17, 2024
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Code U18B7 GMC Description

The U18B7 GMC code indicates that there is a communication issue with the Active Safety Control Module 2 on the Chassis Expansion CAN Bus. The Active Safety Control Module 2 is responsible for managing various safety features in the vehicle, such as traction control, stability control, and collision avoidance systems. The Chassis Expansion CAN Bus is a network that allows different modules in the vehicle to communicate with each other. When communication is lost with the Active Safety Control Module 2, it can lead to a loss of functionality in these safety systems, potentially compromising the vehicle's overall safety.

OBDII Code U18B7 GMC - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus
U18B7 GMC Code - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

Common Causes of U18B7 GMC

  1. Faulty Active Safety Control Module 2.
  2. Wiring or connector issues in the communication network.
  3. Software malfunction within the system.
  4. Damage to the Chassis Expansion CAN Bus.
  5. Electrical interference or signal disruption.

Symptoms of U18B7 GMC

  1. ABS warning light or traction control light illuminated on the dashboard.
  2. Loss of traction control or stability control functionality.
  3. Erratic behavior of safety systems, such as sudden braking or steering interventions.
  4. Vehicle going into "limp mode" to protect itself from further damage.

How to Fix U18B7 GMC

  1. Perform a diagnostic scan to retrieve the specific error codes and pinpoint the issue.
  2. Inspect the wiring and connectors related to the Active Safety Control Module 2 and the Chassis Expansion CAN Bus for any damage or corrosion.
  3. Test the Active Safety Control Module 2 for proper functionality or replace it if necessary.
  4. Clear the error codes and reset the system to ensure proper communication is restored.
  5. Test drive the vehicle to verify that the safety systems are functioning correctly after the repair.

Cost to Fix U18B7 GMC

The cost of repairing a lost communication issue with the Active Safety Control Module 2 on the Chassis Expansion CAN Bus can vary depending on the specific cause of the problem. In general, the cost of parts for replacing the Active Safety Control Module 2 or repairing wiring/connectors can range from $200 to $800. Labor costs at an auto repair shop can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total repair cost for this issue could range from $300 to $1100. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your 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 U18B7 GMC Code

1. What are common symptoms of OBDII code U18B7 GMC?

The common symptoms of OBDII code U18B7 GMC (Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus) include issues with the vehicle's active safety control features, such as traction control, stability control, or anti-lock braking systems.

2. What are possible causes of code U18B7 GMC?

Possible causes of OBDII code U18B7 GMC include wiring or connection issues between the active safety control module and the chassis expansion CAN bus, a faulty active safety control module, or a problem with the chassis expansion CAN bus itself.

3. How can I diagnose OBDII code U18B7 GMC?

Diagnosing OBDII code U18B7 GMC typically involves using a diagnostic scanner to retrieve the code and then performing a thorough inspection of the wiring, connections, and components related to the active safety control module and the chassis expansion CAN bus.

4. Can I still drive my vehicle with code U18B7 GMC?

It is not recommended to drive your vehicle with OBDII code U18B7 GMC present, as it may affect the proper functioning of important safety systems. It is best to address the issue promptly to ensure the safety and performance of your vehicle.

5. How can I repair OBDII code U18B7 GMC?

Repairing OBDII code U18B7 GMC involves identifying and addressing the root cause of the communication loss between the active safety control module and the chassis expansion CAN bus. This may include repairing or replacing damaged wiring, fixing connection issues, or replacing faulty components.

6. Is it possible to reset OBDII code U18B7 GMC without repairs?

While clearing the trouble code may temporarily remove the warning light, the underlying issue causing OBDII code U18B7 GMC will likely persist. It is recommended to diagnose and repair the problem to prevent potential safety hazards and ensure the proper functioning of your vehicle.

7. Can a DIY enthusiast fix OBDII code U18B7 GMC?

Depending on your skill level and access to tools, a DIY enthusiast may be able to address OBDII code U18B7 GMC by checking wiring connections, performing basic electrical tests, and replacing components if needed. However, complex diagnostic procedures may require professional assistance.

8. How much does it cost to repair OBDII code U18B7 GMC?

The cost to repair OBDII code U18B7 GMC can vary depending on the specific cause of the issue and the labor rates in your area. It is recommended to obtain diagnostic information from a qualified technician to determine the exact repair cost.

9. Will OBDII code U18B7 GMC cause my vehicle to fail an emissions test?

OBDII code U18B7 GMC is related to communication issues with the active safety control module and does not directly affect emissions. However, a persistent issue with this code may indicate other underlying problems that could impact emissions performance.

10. How does OBDII code U18B7 GMC impact the overall safety of my vehicle?

OBDII code U18B7 GMC indicates a loss of communication with an essential safety control module, which can compromise the proper functioning of safety systems. Addressing this code promptly is crucial to maintaining the safety of your vehicle and its occupants.

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