AutoCodes – GMC – U007B 2015 GMC Sierra

U007B 2015 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 2015 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 211

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 2015 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 2015 GMC Sierra - Control Module Communication High Speed Extension CAN Bus Off - AutoCodes.com — U007B 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the U007B 2015 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 2015 GMC Sierra Code

1. What does the OBDII code U007B mean on a 2015 GMC Sierra?

The U007B code indicates a communication issue with the High-Speed Extension Controller Area Network (CAN) bus, meaning a control module is unable to communicate properly.

2. What are common symptoms of the U007B code on a 2015 GMC Sierra?

Common symptoms include illuminated warning lights, such as the check engine light, erratic transmission behavior, non-functioning electronic accessories, or a complete lack of communication with the vehicle's diagnostic system.

3. What causes the U007B code to appear on a GMC Sierra?

The code can be caused by a faulty control module, damaged or corroded CAN bus wiring, loose or disconnected connectors, or a short circuit in the wiring.

4. Can I still drive my 2015 GMC Sierra with the U007B code active?

Driving with this code may be possible, but it is not recommended as it could lead to unpredictable vehicle behavior or failure of critical systems.

5. How do I diagnose the U007B code on my 2015 GMC Sierra?

Start by inspecting the CAN bus wiring and connectors for damage or corrosion. Use a diagnostic scan tool to check for communication between modules and test for continuity and proper voltage in the CAN network.

6. How do I fix the U007B code on a 2015 GMC Sierra?

Repairs might include replacing damaged wiring, repairing corroded connections, or replacing a malfunctioning control module. Clearing the code with a scan tool after repairs is essential.

7. Is the U007B code a common problem on the 2015 GMC Sierra?

While not extremely common, communication issues like this can occur, especially in vehicles with high mileage or exposure to harsh environmental conditions.

8. How much does it cost to repair the U007B code on a GMC Sierra?

Repair costs vary based on the underlying issue but could range from $100 for basic wiring repairs to over $1,000 if a control module needs replacement.

9. Can a dead battery cause the U007B code on a 2015 GMC Sierra?

Yes, a weak or dead battery can cause communication issues by disrupting the power supply to the control modules, potentially triggering the U007B code.

10. Do I need a professional mechanic to fix the U007B code?

While basic inspections can be done at home, diagnosing and repairing CAN bus communication issues often require specialized tools and expertise, so consulting a professional is advisable.