AutoCodes – Cadillac – U18B6 Cadillac

U18B6 Cadillac 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 Cadillac 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 542

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 Cadillac 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 Cadillac - Lost Communication With Active Safety Control Module 1 On Chassis Expansion CAN Bus - AutoCodes.com — U18B6 Cadillac 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 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

Get the U18B6 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code U18B6 in a Cadillac related to Lost Communication With Active Safety Control Module 1?

- Common symptoms include warning lights on the dashboard, loss of functionality in active safety features, and potential issues with traction control or stability control systems.

2. What are the possible causes of the U18B6 code indicating Lost Communication With Active Safety Control Module 1 in a Cadillac?

- Possible causes include a faulty Active Safety Control Module, damaged wiring or connectors, a malfunctioning CAN bus network, or a software glitch in the system.

3. How can I diagnose the U18B6 code in my Cadillac related to Lost Communication With Active Safety Control Module 1?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific error codes, checking the wiring and connectors for any visible damage, and performing a thorough inspection of the Active Safety Control Module.

4. Can I still drive my Cadillac with the U18B6 code indicating Lost Communication With Active Safety Control Module 1?

- It is not recommended to drive the vehicle with this code present, as it may affect the proper functioning of critical safety systems. It is best to address the issue promptly.

5. How can I repair the U18B6 code on my Cadillac related to Lost Communication With Active Safety Control Module 1?

- Repairing the issue may involve repairing or replacing damaged wiring or connectors, resetting the Active Safety Control Module, updating software if needed, or replacing the module itself if it is found to be faulty.

6. Is it possible to reset the U18B6 code indicating Lost Communication With Active Safety Control Module 1 in a Cadillac without fixing the underlying issue?

- While clearing the code temporarily may extinguish warning lights, the underlying problem will persist and may lead to safety concerns. It is recommended to address the root cause of the code.

7. Will fixing the U18B6 code related to Lost Communication With Active Safety Control Module 1 in my Cadillac be costly?

- The cost of repair can vary depending on the specific issue causing the code. Simple fixes like repairing wiring may be relatively inexpensive, while replacing the Active Safety Control Module can be more costly.

8. How long does it typically take to repair the U18B6 code in a Cadillac indicating Lost Communication With Active Safety Control Module 1?

- The repair time can vary based on the exact cause of the code and the complexity of the fix. It may range from a quick wiring repair to a more involved module replacement, which could take several hours.