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

Quick Answer

The U18B6 Chevrolet code indicates that there is a communication problem between the Active Safety Control Module 1 and the chassis expansion CAN bus in the vehicle. Common causes include Faulty Active Safety Control Module 1, Wiring or connection issues between the module and the CAN bus, Corrosion or damage to the CAN bus wiring. 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 Chevrolet indicates Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus.
Common causes
Common causes include Faulty Active Safety Control Module 1, Wiring or connection issues between the module and the CAN bus, Corrosion or damage to the CAN bus wiring.
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 Aug 19, 2024
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Code U18B6 Chevrolet Description

The U18B6 Chevrolet code indicates that there is a communication problem between the Active Safety Control Module 1 and the chassis expansion CAN bus in the vehicle. The Active Safety Control Module 1 is responsible for monitoring and controlling various safety features in the vehicle, such as traction control, stability control, and anti-lock brakes. When communication is lost between this module and the CAN bus, it can lead to a loss of functionality in these safety systems, potentially compromising the vehicle's overall safety.

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

Common Causes of U18B6 Chevrolet

  1. Faulty Active Safety Control Module 1
  2. Wiring or connection issues between the module and the CAN bus
  3. Corrosion or damage to the CAN bus wiring
  4. Software issues within the module or the vehicle's control systems

Symptoms of U18B6 Chevrolet

  1. Illumination of the ABS, traction control, or stability control warning lights on the dashboard
  2. Loss of traction control or stability control functionality
  3. Inconsistent braking performance
  4. Erratic behavior of safety systems during driving

How to Fix U18B6 Chevrolet

  1. Perform a thorough inspection of the wiring and connections between the Active Safety Control Module 1 and the CAN bus
  2. Test the module for proper functionality and communication
  3. Repair or replace any damaged wiring or connections
  4. Update or reprogram the software in the module, if necessary
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue has been resolved

Cost to Fix U18B6 Chevrolet

The cost estimate for repairing the U18B6 Chevrolet code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it is important to note that prices may differ based on the location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a trusted mechanic or dealership to get an accurate estimate for this repair.

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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 Chevrolet Code

1. What are the common symptoms of OBDII code U18B6 in a Chevrolet related to lost communication with Active Safety Control Module 1?

- Common symptoms include the loss of functions controlled by the Active Safety Control Module, such as traction control, stability control, and other safety features.

2. What are some possible causes of OBDII code U18B6 in a Chevrolet indicating a communication issue with Active Safety Control Module 1?

- Possible causes include a faulty Active Safety Control Module, damaged wiring or connectors in the CAN bus system, or a software error within the module.

3. How can I diagnose the root cause of OBDII code U18B6 in my Chevrolet when it indicates a loss of communication with Active Safety Control Module 1?

- A thorough diagnostic scan using a professional OBDII scanner can help pinpoint the exact cause of the communication issue, whether it's a hardware failure or a software glitch.

4. Is it safe to continue driving my Chevrolet with OBDII code U18B6 indicating a problem with Active Safety Control Module 1 communication?

- It is not recommended to continue driving the vehicle when this code is present, as it may result in the loss of important safety functions that could compromise vehicle control and safety.

5. What are the repair options for fixing OBDII code U18B6 in a Chevrolet due to lost communication with Active Safety Control Module 1?

- Repair options may include replacing the Active Safety Control Module, repairing or replacing damaged wiring or connectors in the CAN bus system, or updating the module's software.

6. Can I reset OBDII code U18B6 in my Chevrolet related to the Active Safety Control Module 1 communication issue by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it will likely reappear if the underlying communication problem between the module and the CAN bus system is not addressed.

7. How much does it typically cost to repair OBDII code U18B6 in a Chevrolet caused by a lost communication with Active Safety Control Module 1?

- The cost of repair can vary depending on the exact cause of the communication issue, but it may involve parts and labor expenses ranging from a few hundred to a thousand dollars.

8. Are there any preventative maintenance steps I can take to avoid encountering OBDII code U18B6 in my Chevrolet due to communication problems with Active Safety Control Module 1?

- Regularly inspecting the wiring and connectors in the CAN bus system, as well as keeping the Active Safety Control Module software up to date, can help prevent communication issues that trigger this code.

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