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Engine-Codes – Generic – U18B6

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

Quick Answer

The diagnostic trouble code U18B6 indicates that there is a communication problem with the Active Safety Control Module 1 on the Chassis Expansion CAN Bus in the vehicle. Common causes include Faulty Active Safety Control Module, Damaged wiring or connectors in the CAN Bus network, Software glitches or programming errors. 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 indicates Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus.
Common causes
Common causes include Faulty Active Safety Control Module, Damaged wiring or connectors in the CAN Bus network, Software glitches or programming errors.
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 11, 2024
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Code U18B6 Description

The diagnostic trouble code U18B6 indicates that there is a communication problem with the Active Safety Control Module 1 on the Chassis Expansion CAN Bus in the vehicle. The Active Safety Control Module is responsible for managing various safety features in the vehicle, such as collision avoidance systems, lane departure warning, and adaptive cruise control. The Chassis Expansion CAN Bus is a network that allows different modules in the vehicle to communicate with each other.

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

Common Causes of U18B6

  1. Faulty Active Safety Control Module
  2. Damaged wiring or connectors in the CAN Bus network
  3. Software glitches or programming errors
  4. Issues with the vehicle's main computer system
  5. Water damage or corrosion in the module or wiring

Symptoms of U18B6

  1. Malfunction indicator light (MIL) or check engine light illuminated on the dashboard
  2. Loss of functionality in safety features such as collision warning or lane departure warning
  3. Erratic behavior in adaptive cruise control
  4. Inability to engage certain safety systems
  5. Diagnostic trouble codes related to communication errors or lost module communication

How to Fix U18B6

  1. Conduct a thorough diagnostic scan to identify the specific module causing the communication issue
  2. Inspect the wiring and connectors in the CAN Bus network for any damage or corrosion
  3. Check for software updates or reprogramming that may be required for the affected module
  4. Replace the faulty Active Safety Control Module if necessary
  5. Clear the diagnostic trouble codes and test the functionality of the safety systems

Cost to Fix U18B6

The typical repair costs for a lost communication issue with the Active Safety Control Module can range from $200 to $600, including parts and labor. However, the actual cost can vary significantly based on the extent of the problem, the specific components that need to be replaced, and the hourly labor rates at the repair shop. It's recommended to consult with a professional technician to get an accurate estimate for your specific vehicle.

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Code U18B6 Information for Specific Makes

  • U18B6 Buick — Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus
  • U18B6 Cadillac — Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus
  • U18B6 Chevrolet — Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus
  • U18B6 GMC — Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus
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 Code

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

- Common symptoms include loss of communication with the active safety control module, warning lights on the dashboard, and potential loss of certain safety features.

2. What are the possible causes of OBDII code U18B6?

- Possible causes include a faulty active safety control module, damaged wiring or connectors in the CAN bus system, or a software issue within the control module.

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

- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking for other related trouble codes, and inspecting the wiring and connectors for any visible damage.

4. Is it safe to drive with OBDII code U18B6 present?

- It is not recommended to drive with this code present, as it may indicate a potential issue with important safety systems in the vehicle.

5. How can I repair OBDII code U18B6?

- Repair options include repairing or replacing any damaged wiring or connectors, reprogramming the active safety control module, or replacing the module if it is deemed faulty.

6. Can OBDII code U18B6 be a false alarm?

- While rare, it is possible for this code to be triggered by a temporary communication glitch. Clearing the code and monitoring the situation may help determine if it was a false alarm.

7. Will OBDII code U18B6 cause the vehicle to fail an emissions test?

- The presence of this code alone may not cause the vehicle to fail an emissions test, but it should still be addressed to ensure proper functioning of safety systems.

8. How much does it typically cost to repair OBDII code U18B6?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can I reset OBDII code U18B6 on my own?

- You can reset the code using an OBDII scanner, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

10. How long does it take to repair OBDII code U18B6?

- The repair time can vary based on the specific repair needed, but it may take anywhere from a few hours to a full day to diagnose and fix the issue.

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