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U007B 2015 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Quick Answer

The U007B diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Control Module Communication High Speed Extension CAN Bus being off. Common causes include Faulty wiring or connections in the CAN bus network, Malfunctioning control module, Software glitches or programming errors. 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 Faulty wiring or connections in the CAN bus network, Malfunctioning control module, Software glitches or programming errors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code U007B 2015 GMC Sierra Description

The U007B diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Control Module Communication High Speed Extension CAN Bus being off. In modern vehicles, there are multiple control modules that communicate with each other through a network called the Controller Area Network (CAN) bus. The high-speed extension CAN bus is responsible for facilitating communication between various modules at a faster rate than the standard CAN bus.

OBDII Code U007B 2015 GMC Sierra - Control Module Communication High Speed Extension CAN Bus Off
U007B 2015 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Common Causes of U007B 2015 GMC Sierra

  1. Faulty wiring or connections in the CAN bus network
  2. Malfunctioning control module
  3. Software glitches or programming errors
  4. Water or physical damage to the CAN bus network
  5. Electrical interference from aftermarket accessories or modifications

Symptoms of U007B 2015 GMC Sierra

  1. Check engine light illuminated
  2. Loss of communication with certain control modules
  3. Erratic behavior of electronic components (e.g., power windows, radio)
  4. Reduced fuel efficiency
  5. Drivability issues (e.g., rough idling, stalling)

How to Fix U007B 2015 GMC Sierra

  1. Perform a thorough inspection of the CAN bus network, wiring, and connections to identify any visible damage or loose connections.
  2. Use a diagnostic scan tool to communicate with the affected control modules and identify the specific module causing the communication issue.
  3. Check for any software updates or reprogramming that may address the communication problem.
  4. Replace any faulty control modules or damaged wiring as needed to restore proper communication on the high-speed extension CAN bus.
  5. Perform a final system check and clear the trouble codes to verify that the issue has been resolved.

Cost to Fix U007B 2015 GMC Sierra

The cost of repairing a U007B code in a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate based on various factors, so it's advisable to get a detailed estimate from a trusted mechanic before proceeding with the repair.

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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.

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