AutoCodes – Chevrolet – U18B6 Chevrolet

U18B6 Chevrolet 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 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, 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.

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Code Popularity 595

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

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 Chevrolet?

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 Chevrolet 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.

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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.