AutoCodes – Buick – U18B6 Buick

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

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Active Safety Control Module 1, Active Safety Control Module 1 harness is open or shorted, Active Safety Control Module 1 circuit poor electrical connection. 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 Buick 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, Active Safety Control Module 1 harness is open or shorted, Active Safety Control Module 1 circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 515

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U18B6 Buick Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18B6 Buick - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus - AutoCodes.com — U18B6 Buick Code - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18B6 Buick?

Faulty Active Safety Control Module 1
Active Safety Control Module 1 harness is open or shorted
Active Safety Control Module 1 circuit poor electrical connection

How to Fix the DTC U18B6 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U18B6 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U18B6 Buick code?

Need more information on how to fix the U18B6 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U18B6 Buick code diagnosed by a professional: Find a repair shop in your area

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 Buick Code

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

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

2. What could cause the OBDII code U18B6 in a Buick indicating lost communication with the Active Safety Control Module?

- Possible causes include wiring issues, a faulty Active Safety Control Module, a problem with the chassis expansion CAN bus, or a communication network issue.

3. How can I diagnose the OBDII code U18B6 in a Buick related to the Active Safety Control Module?

- Diagnose by checking the wiring connections, inspecting the Active Safety Control Module for damage, testing the chassis expansion CAN bus, and using a diagnostic scan tool to read the code.

4. Can I still drive my Buick with the U18B6 code related to the Active Safety Control Module issue?

- It's not recommended to drive the vehicle with this code present, as it may affect the operation of critical safety features.

5. What are some repair tips for fixing the U18B6 code in a Buick due to lost communication with the Active Safety Control Module?

- Repair tips include checking and repairing any damaged wiring, replacing the Active Safety Control Module if necessary, and ensuring proper communication network functionality.

6. Is it possible to reset the OBDII code U18B6 in a Buick without fixing the underlying issue?

- While clearing the code may temporarily turn off the warning light, the issue causing the code will likely persist and retrigger the fault code.

7. How much does it typically cost to repair the U18B6 code in a Buick related to the Active Safety Control Module?

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

8. Can a DIY mechanic fix the U18B6 code in a Buick, or should it be done by a professional?

- The complexity of diagnosing and repairing this code may require professional expertise, but experienced DIY mechanics with the right tools and knowledge may attempt the repair.

9. Are there any recalls or technical service bulletins related to the U18B6 code in Buick vehicles?

- Check with Buick or a dealership to see if there are any recalls or technical service bulletins addressing this specific OBDII code in your vehicle.

10. How urgent is it to address the U18B6 code in a Buick indicating lost communication with the Active Safety Control Module?

- It is recommended to address this issue promptly to ensure the proper functioning of safety systems in the vehicle and to avoid potential safety hazards.