AutoCodes – Chevrolet – U18B7 Chevrolet

U18B7 Chevrolet Code - Lost Communication With Active Safety Control Module 2 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 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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: U18B7 Chevrolet indicates Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus.
Common causes: Common causes include Faulty Active Safety Control Module 2, Active Safety Control Module 2 harness is open or shorted, Active Safety Control Module 2 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 531

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18B7 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 U18B7 Chevrolet - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus - AutoCodes.com — U18B7 Chevrolet Code - Lost Communication With Active Safety Control Module 2 On Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18B7 Chevrolet?

Faulty Active Safety Control Module 2
Active Safety Control Module 2 harness is open or shorted
Active Safety Control Module 2 circuit poor electrical connection

How to Fix the DTC U18B7 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 U18B7 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.

Need more information about the U18B7 Chevrolet code?

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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 U18B7 Chevrolet Code

1. What are the common symptoms of OBDII code U18B7 in a Chevrolet related to lost communication with Active Safety Control Module 2 on Chassis Expansion CAN Bus?

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

2. What are some possible causes of the U18B7 code indicating lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus in a Chevrolet?

- Possible causes may include wiring harness issues, loose connections, a faulty Active Safety Control Module 2, a defective CAN bus communication network, or a malfunctioning powertrain control module.

3. How can I diagnose the U18B7 code in my Chevrolet related to lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific trouble codes, followed by inspecting the wiring, connectors, and modules associated with the Active Safety Control Module 2 and the CAN bus network.

4. What are some repair tips for addressing the U18B7 code in a Chevrolet due to lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus?

- Repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper grounding, resetting the system, updating software if applicable, and replacing any faulty components identified during diagnosis.

5. Can I continue driving my Chevrolet with the U18B7 code related to lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus?

- It is not recommended to continue driving the vehicle with this code present, as it may affect the proper functioning of critical safety systems. Seek professional diagnosis and repair to ensure safe operation.

6. How much does it typically cost to repair the U18B7 code indicating lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus in a Chevrolet?

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

7. Is the U18B7 OBDII code specific to Chevrolet vehicles, or can it occur in other car makes and models?

- The U18B7 code related to lost communication with Active Safety Control Module 2 on the Chassis Expansion CAN Bus is specific to Chevrolet vehicles and may not apply to other car manufacturers.