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Engine-Codes – Generic – U007B

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

Quick Answer

The U007B code indicates that there is a communication issue with the high-speed extension CAN bus in the vehicle's control module. Common causes include Faulty control module, Damaged or corroded wiring, Software glitches in control modules. 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 indicates Control Module Communication High Speed Extension CAN Bus Off.
Common causes
Common causes include Faulty control module, Damaged or corroded wiring, Software glitches in control modules.
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 05, 2024
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Code U007B Description

The U007B code indicates that there is a communication issue with the high-speed extension CAN bus in the vehicle's control module. The CAN bus (Controller Area Network) is a communication network that allows various control modules in the vehicle to communicate with each other. When this code is triggered, it means that there is a disruption or loss of communication on the high-speed CAN bus, which can lead to malfunctions in various vehicle systems.

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

Common Causes of U007B

  1. Faulty control module
  2. Damaged or corroded wiring
  3. Software glitches in control modules
  4. Electrical interference
  5. Issues with the CAN bus network

Symptoms of U007B

  1. Check Engine Light illuminated
  2. Rough idling or engine stalling
  3. Inconsistent or jerky shifting
  4. ABS or traction control warning lights illuminated
  5. Loss of power or acceleration

How to Fix U007B

  1. Diagnose the specific control module or wiring causing the issue
  2. Repair or replace damaged wiring
  3. Update control module software
  4. Check for electrical interference and shield wiring if necessary
  5. Reset the control module and clear the code

Cost to Fix U007B

The typical repair costs for addressing the U007B code can vary depending on the specific cause of the issue. On average, the repair could range from $100 to $500, including parts and labor. However, it's important to note that the actual cost can be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to obtain a detailed estimate from a qualified mechanic or repair shop before proceeding with the repair.

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Code U007B Information for Specific Makes

  • U007B Buick — Control Module Communication High Speed Extension CAN Bus Off
  • U007B Cadillac — Control Module Communication High Speed Extension CAN Bus Off
  • U007B Chevrolet — Control Module Communication High Speed Extension CAN Bus Off
  • U007B GMC — Control Module Communication High Speed Extension CAN Bus Off
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 Code

1. What are the common symptoms of OBDII code U007B?

- Common symptoms include issues with the vehicle's communication network, such as intermittent or total loss of communication between control modules.

2. What can cause the OBDII code U007B to trigger?

- This code can be triggered by a fault in the high-speed extension Controller Area Network (CAN) bus communication system, such as a wiring issue, faulty control module, or a disrupted network connection.

3. How can I diagnose the OBDII code U007B?

- Diagnosing this code typically involves using a professional OBDII scanner to check for communication faults, inspecting the wiring connections, and performing network communication tests among control modules.

4. What repair steps can I take to address the OBDII code U007B?

- Repair steps may include repairing or replacing damaged wiring, checking and reprogramming control modules, and ensuring proper network communication among modules.

5. Can I still drive my vehicle with the OBDII code U007B present?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential safety hazards and affect the performance of various vehicle systems.

6. How much does it typically cost to repair the OBDII code U007B?

- Repair costs for this code can vary depending on the underlying cause of the communication issue, but it is advisable to consult with a professional mechanic for an accurate estimate.

7. Are there any preventative maintenance measures I can take to avoid the OBDII code U007B?

- Regularly checking and maintaining the vehicle's electrical system, including the wiring connections and control modules, can help prevent communication issues that may trigger this code.

8. Will resetting the OBDII code U007B make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently. It is essential to diagnose and repair the root cause to prevent the code from reoccurring.

9. Can a DIY enthusiast without professional tools fix the OBDII code U007B?

- While basic troubleshooting like checking wiring connections can be done by a DIY enthusiast, diagnosing and repairing complex communication issues may require professional tools and expertise.

10. How long does it typically take to repair the OBDII code U007B?

- The repair time for this code can vary depending on the specific cause and complexity of the issue. Some repairs may be completed within a few hours, while others may take longer if extensive troubleshooting is required.

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