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Engine-Codes – Generic – U18B7

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

Quick Answer

The U18B7 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with Active Safety Control Module 2 on the Chassis Expansion Controller Area Network (CAN) Bus. Common causes include Faulty wiring or connectors in the CAN bus network, A malfunctioning Active Safety Control Module 2, Software glitches in the vehicle's onboard computer. 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 indicates Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus.
Common causes
Common causes include Faulty wiring or connectors in the CAN bus network, A malfunctioning Active Safety Control Module 2, Software glitches in the vehicle's onboard computer.
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 Description

The U18B7 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with Active Safety Control Module 2 on the Chassis Expansion Controller Area Network (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. When communication is lost with this module, it can lead to a range of safety-related issues and potentially impact the overall performance of the vehicle.

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

Common Causes of U18B7

  1. Faulty wiring or connectors in the CAN bus network.
  2. A malfunctioning Active Safety Control Module 2.
  3. Software glitches in the vehicle's onboard computer.
  4. Water or corrosion damage to the CAN bus components.
  5. Electrical interference from aftermarket accessories or modifications.

Symptoms of U18B7

  1. Illumination of the traction control, stability control, or ABS warning lights on the dashboard.
  2. Loss of traction control or stability control during driving.
  3. Inability to activate collision avoidance features.
  4. Reduced responsiveness of safety systems in emergency situations.

How to Fix U18B7

  1. Begin by conducting a thorough inspection of the CAN bus wiring and connectors for any signs of damage or corrosion.
  2. Use a diagnostic scan tool to attempt to establish communication with the Active Safety Control Module 2 and identify any fault codes stored in the system.
  3. If no visible issues are found, consider reprogramming or replacing the Active Safety Control Module 2.
  4. Clear the DTC from the vehicle's memory and perform a test drive to verify that the communication has been restored and the safety systems are functioning properly.
  5. If the issue persists, consult with a professional technician or dealership for further diagnosis and repair.

Cost to Fix U18B7

The typical repair costs for addressing the U18B7 code can vary depending on the specific cause of the communication loss and the extent of the repairs needed. In general, repairing wiring or connectors in the CAN bus network may cost between $100 to $300, while replacing the Active Safety Control Module 2 can range from $500 to $1000. Additional costs for diagnostic time and labor rates at auto repair shops should be factored in, with hourly rates typically ranging from $80 to $150. It's advisable to obtain a detailed estimate from a qualified technician based on the vehicle's make and model, as well as the specific circumstances of the issue.

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Code U18B7 Information for Specific Makes

  • U18B7 Buick — Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus
  • U18B7 Cadillac — Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus
  • U18B7 Chevrolet — Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus
  • U18B7 GMC — Lost Communication With Active Safety Control Module 2 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 U18B7 Code

1. What are common symptoms of OBDII code U18B7?

- Common symptoms include loss of communication with Active Safety Control Module 2, warning lights on the dashboard, and potential issues with active safety features.

2. What could cause OBDII code U18B7 to trigger?

- This code is usually triggered by a communication error between the vehicle's main computer and the Active Safety Control Module 2 on the Chassis Expansion CAN Bus.

3. How can I diagnose the issue related to code U18B7?

- Diagnosing the issue involves checking the wiring and connections related to the Active Safety Control Module 2, as well as scanning the system for any other related trouble codes.

4. What are some possible repair tips for resolving code U18B7?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, resetting the system, and reprogramming the Active Safety Control Module 2 if necessary.

5. Can code U18B7 be safely ignored?

- Ignoring this code is not recommended, as it may lead to safety system malfunctions and compromise the vehicle's active safety features.

6. Is it safe to drive with OBDII code U18B7 present?

- It is not advisable to drive with this code present, as it indicates a potential issue with the vehicle's active safety systems that could affect overall safety.

7. How much does it typically cost to repair OBDII code U18B7?

- The cost of repairing this code can vary depending on the underlying cause, but it may involve labor costs for diagnosis and repair, as well as potential part replacement expenses.

8. Can a DIY enthusiast fix OBDII code U18B7 at home?

- While some simple checks like inspecting connections can be done at home, resolving code U18B7 may require specialized tools and expertise, so it's often best left to professional mechanics.

9. Will resetting the OBDII system clear code U18B7?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for some time.

10. How urgent is it to address OBDII code U18B7?

- It is recommended to address code U18B7 promptly to ensure the proper functioning of the vehicle's active safety systems and maintain overall safety while driving.

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