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U007B 2017 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Quick Answer

The U007B code for a 2017 GMC Sierra indicates an issue with the Control Module Communication High-Speed Extension CAN Bus being off. Common causes include Faulty control module, Wiring or connection issues in the CAN bus system, Water or corrosion damage to the connectors. 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 2017 GMC Sierra indicates Control Module Communication High Speed Extension CAN Bus Off.
Common causes
Common causes include Faulty control module, Wiring or connection issues in the CAN bus system, Water or corrosion damage to the connectors.
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 11, 2024
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Code U007B 2017 GMC Sierra Description

The U007B code for a 2017 GMC Sierra indicates an issue with the Control Module Communication High-Speed Extension CAN Bus being off. The Controller Area Network (CAN) bus is a communication network within the vehicle that allows various control modules to communicate with each other. In this case, the high-speed extension CAN bus is experiencing a disruption in communication, which can lead to a range of issues affecting the vehicle's performance.

OBDII Code U007B 2017 GMC Sierra - Control Module Communication High Speed Extension CAN Bus Off
U007B 2017 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus Off

Common Causes of U007B 2017 GMC Sierra

  1. Faulty control module
  2. Wiring or connection issues in the CAN bus system
  3. Water or corrosion damage to the connectors
  4. Electrical interference from aftermarket accessories
  5. Software glitches in the control modules

Symptoms of U007B 2017 GMC Sierra

  1. Rough idling or stalling
  2. Poor acceleration
  3. Check Engine Light illuminated
  4. Loss of power
  5. Transmission shifting issues

How to Fix U007B 2017 GMC Sierra

  1. Perform a diagnostic scan to confirm the U007B code and identify the specific control module causing the communication issue.
  2. Inspect the wiring and connections in the CAN bus system for any damage or corrosion. Repair or replace as needed.
  3. Check for any aftermarket accessories causing electrical interference and remove if necessary.
  4. Update the software in the control modules to address any glitches that may be causing the communication error.
  5. Clear the code, reset the system, and perform a test drive to ensure the issue has been resolved.

Cost to Fix U007B 2017 GMC Sierra

The typical repair costs for addressing a U007B code in a 2017 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. However, it's important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. It's recommended to consult with a trusted mechanic to get a more accurate estimate based on your specific situation. Keep in mind that diagnostic time and labor rates can vary, with rates typically ranging between $80 and $150 per hour.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code U007B in a 2017 GMC Sierra?

The common symptoms include issues with the vehicle's communication network, such as warning lights on the dashboard, erratic behavior of electronic components, and difficulty starting the vehicle.

2. What does the U007B code "Control Module Communication High Speed Extension CAN Bus Off" mean for a 2017 GMC Sierra?

This code indicates a communication problem within the high-speed extension Controller Area Network (CAN) bus network in the vehicle, specifically related to the control modules.

3. What are the possible causes of the U007B code in a 2017 GMC Sierra?

Possible causes include faulty control modules, damaged wiring or connectors in the CAN bus network, software glitches, low voltage issues, or a malfunctioning powertrain control module (PCM).

4. How can I diagnose the U007B code in a 2017 GMC Sierra?

Diagnosing this code requires using a professional OBDII scanner to read the fault codes, checking the CAN bus network for continuity, inspecting the control modules for damage, and testing the voltage levels in the system.

5. Can I drive my 2017 GMC Sierra with the U007B code present?

It is not recommended to drive the vehicle with this code present, as it may lead to further electrical issues or potential safety hazards. It's best to address the underlying problem before operating the vehicle.

6. How can I repair the U007B code in a 2017 GMC Sierra?

Repairing this code may involve replacing faulty control modules, repairing damaged wiring or connectors, updating software, addressing voltage issues, or consulting with a professional mechanic for further assistance.

7. Is the U007B code covered under any warranties for a 2017 GMC Sierra?

Depending on the vehicle's warranty status and the specific circumstances, the repair for this code may be covered under the manufacturer's warranty or extended warranty. It's advisable to check with the dealership or warranty provider.

8. Are there any recalls related to the U007B code for a 2017 GMC Sierra?

Recalls related to this specific code may vary, so it's recommended to check with the manufacturer or the National Highway Traffic Safety Administration (NHTSA) to see if there are any relevant recalls for your vehicle.

9. Can a DIY enthusiast fix the U007B code issue in a 2017 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing complex communication network issues like the U007B code may require specialized tools and expertise. It's advisable to consult with a professional mechanic for proper repair.

10. How can I prevent the U007B code from appearing in my 2017 GMC Sierra in the future?

Regular maintenance, timely software updates, careful handling of electrical components, and addressing any warning signs promptly can help prevent the recurrence of the U007B code in your GMC Sierra.

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