AutoCodes – GMC – U007B 2014 GMC Sierra

U007B 2014 GMC Sierra 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 2014 GMC Sierra 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 174

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 2014 GMC Sierra 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 2014 GMC Sierra - Control Module Communication High Speed Extension CAN Bus Off - AutoCodes.com — U007B 2014 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U007B 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra code?

Need more information on how to fix the U007B 2014 GMC Sierra code? Get Access to Factory Service Manuals

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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 U007B 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code U007B in a 2014 GMC Sierra?

The common symptoms of code U007B include issues with the vehicle's communication system, such as intermittent or complete loss of communication between control modules.

2. What can cause the OBDII code U007B to appear in a 2014 GMC Sierra?

The code U007B in a 2014 GMC Sierra is often triggered by a high-speed communication fault in the Controller Area Network (CAN) bus system, usually due to wiring issues, damaged modules, or faulty connectors.

3. How can I diagnose the OBDII code U007B in my 2014 GMC Sierra?

Diagnosing code U007B typically involves using a diagnostic scanner to communicate with various control modules in the vehicle and inspecting the wiring and connectors for any signs of damage or corrosion.

4. Can I still drive my 2014 GMC Sierra with the U007B code present?

Continuing to drive your GMC Sierra with code U007B present is not recommended, as it may lead to further communication issues between control modules, potentially affecting the vehicle's performance and safety systems.

5. How can I repair the U007B code in my 2014 GMC Sierra?

Repairing the U007B code often involves addressing the underlying communication fault in the CAN bus system, which may require repairing or replacing damaged wiring, modules, or connectors.

6. Is it necessary to reset the OBDII code U007B after repairing the issue in a 2014 GMC Sierra?

Yes, it is important to clear the U007B code after resolving the communication fault to reset the vehicle's system and ensure that the issue has been successfully addressed.

7. Are there any preventive measures to avoid the OBDII code U007B in a 2014 GMC Sierra?

Regularly inspecting and maintaining the vehicle's wiring harnesses, connectors, and control modules can help prevent communication faults that trigger the U007B code in a 2014 GMC Sierra.

8. Can a DIY enthusiast fix the U007B code issue in a 2014 GMC Sierra?

While diagnosing and repairing the U007B code may be challenging for DIY enthusiasts due to the complexity of the vehicle's communication system, some basic troubleshooting steps can be attempted before seeking professional help.

9. Will the U007B code in a 2014 GMC Sierra cause the vehicle to fail an emissions test?

Yes, the U007B code can potentially lead to a failed emissions test, as it indicates a malfunction in the vehicle's communication system, which can impact emissions control and other vital systems.

10. How long does it typically take to repair the U007B code issue in a 2014 GMC Sierra?

The time required to repair the U007B code can vary depending on the specific cause of the communication fault. Simple issues like loose connectors may be resolved quickly, while more complex wiring problems may take longer to diagnose and fix.