AutoCodes – Chevrolet – U007B Chevrolet

U007B Chevrolet Code - Control Module Communication High Speed Extension CAN Bus Off

Quick Answer

The devices connected to the object high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted. 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: U007B Chevrolet indicates Control Module Communication High Speed Extension CAN Bus Off.
Common causes: Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted.
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 1,577

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 Jul 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U007B Chevrolet Description

The devices connected to the object high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices when the ignition switch is in any position other than OFF. The object high speed GMLAN serial data bus uses terminating resistors that are in parallel with the object high speed GMLAN (+) and (-) circuits. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U007B Chevrolet - Control Module Communication High Speed Extension CAN Bus Off - AutoCodes.com — U007B Chevrolet Code - Control Module Communication High Speed Extension CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U007B Chevrolet?

Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U007B 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 U007B 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 U007B Chevrolet code?

Need more information on how to fix the U007B Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U007B Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

U007B 2014 Chevrolet Silverado — Control Module Communication High Speed Extension CAN Bus Off
U007B 2015 Chevrolet Silverado — Control Module Communication High Speed Extension CAN Bus Off
U007B 2016 Chevrolet Silverado — Control Module Communication High Speed Extension CAN Bus Off
U007B 2017 Chevrolet Silverado — Control Module Communication High Speed Extension CAN Bus Off
U007B 2018 Chevrolet Silverado — Control Module Communication High Speed Extension CAN Bus Off

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 U007B Chevrolet Code

What does the OBDII code U007B mean for a Chevrolet?

The code U007B indicates a communication issue on the High-Speed Extension CAN Bus, where one or more control modules are unable to send or receive data.

What are the common symptoms of the U007B code in a Chevrolet?

Symptoms may include warning lights such as the check engine light, reduced performance, erratic shifting, or a complete loss of communication with certain modules.

What causes the U007B code to appear in a Chevrolet?

Common causes include damaged wiring, loose or corroded connectors, failed control modules, or electrical interference in the CAN bus network.

Can a weak battery cause the U007B code?

Yes, a weak or failing battery can lead to insufficient voltage, disrupting communication between modules and triggering the code.

How can I diagnose the U007B code on my Chevrolet?

Use an OBDII scanner to identify the code, inspect wiring and connectors for damage or corrosion, and check the voltage levels to ensure proper power supply to the modules.

Is it safe to drive with the U007B code active?

Driving with the U007B code may be unsafe as it can affect critical systems like transmission or stability control. It is recommended to address the issue promptly.

How do I repair the U007B code on a Chevrolet?

Repairs may involve fixing damaged wiring, cleaning or replacing corroded connectors, reprogramming or replacing faulty control modules, or ensuring a stable power supply.

Can a software update fix the U007B code?

In some cases, a software update for the affected control module may resolve communication issues. Consult your dealership or a specialized mechanic for guidance.

What tools are needed to troubleshoot the U007B code?

A diagnostic scanner, multimeter, and wiring diagrams for your Chevrolet are essential tools for troubleshooting this code.

Could aftermarket modifications cause the U007B code?

Yes, aftermarket accessories that interfere with the CAN bus network or improperly installed components can trigger communication errors like the U007B code.