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U007B 2014 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Quick Answer

The U007B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus being off. Common causes include Damaged wiring or connectors in the high-speed extension CAN bus, Faulty control modules that are not communicating properly, 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 2014 GMC Sierra indicates Control Module Communication High Speed Extension CAN Bus Off.
Common causes
Common causes include Damaged wiring or connectors in the high-speed extension CAN bus, Faulty control modules that are not communicating properly, 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 16, 2024
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Code U007B 2014 GMC Sierra Description

The U007B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus being off. The Controller Area Network (CAN) bus is a communication network that allows various modules within a vehicle to communicate with each other. In this case, the high-speed extension CAN bus is responsible for transmitting data between specific control modules at a higher speed than the standard CAN bus.

OBDII Code U007B 2014 GMC Sierra - Control Module Communication High Speed Extension CAN Bus Off
U007B 2014 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Common Causes of U007B 2014 GMC Sierra

  1. Damaged wiring or connectors in the high-speed extension CAN bus.
  2. Faulty control modules that are not communicating properly.
  3. Software glitches or programming errors.
  4. Corrosion or moisture in the CAN bus connections.
  5. Physical damage to the CAN bus network.

Symptoms of U007B 2014 GMC Sierra

  1. Check engine light illuminated on the dashboard.
  2. Loss of communication with certain control modules.
  3. Erratic behavior in vehicle systems, such as transmission shifting irregularities.
  4. Reduced fuel efficiency.
  5. Vehicle stalling or hesitation during acceleration.

How to Fix U007B 2014 GMC Sierra

  1. Perform a comprehensive diagnostic scan to retrieve the specific trouble codes and pinpoint the affected control modules.
  2. Inspect the wiring, connectors, and terminals related to the high-speed extension CAN bus for any signs of damage or corrosion.
  3. Test the control modules involved in the communication network to determine if any are faulty and need replacement.
  4. Clear the trouble codes from the vehicle's memory and reset the affected control modules.
  5. Conduct a road test to ensure that the communication issue has been resolved and that all systems are functioning properly.

Cost to Fix U007B 2014 GMC Sierra

The typical repair costs for addressing a U007B code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, parts and labor for diagnosing and repairing communication problems with the high-speed extension CAN bus can range from $200 to $500. However, it's important to note that actual costs may differ based on factors such as location, dealership rates, and the extent of the repair needed. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate tailored to your vehicle's situation.

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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.

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