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Engine-Codes – Generic – U007D

U007D Code - Control Module Communication Low Speed Extension CAN Bus Off

Quick Answer

The U007D diagnostic trouble code (DTC) indicates an issue with the Control Module Communication Low Speed Extension CAN Bus being off. Common causes include Faulty control module, Wiring harness issues, Software glitches. 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
U007D indicates Control Module Communication Low Speed Extension CAN Bus Off.
Common causes
Common causes include Faulty control module, Wiring harness issues, Software glitches.
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 09, 2024
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Code U007D Description

The U007D diagnostic trouble code (DTC) indicates an issue with the Control Module Communication Low Speed Extension CAN Bus being off. The Controller Area Network (CAN) bus is a network of interconnected control modules in a vehicle that communicate with each other to ensure proper operation and functionality. The low-speed extension CAN bus is a specific branch of this network that operates at a lower data transmission rate.

OBDII Code U007D - Control Module Communication Low Speed Extension CAN Bus Off
U007D Code - Control Module Communication Low Speed Extension CAN Bus Off

Common Causes of U007D

  1. Faulty control module
  2. Wiring harness issues
  3. Software glitches
  4. Poor connections within the CAN bus network
  5. Moisture or corrosion in connectors

Symptoms of U007D

  1. Dashboard warning lights illuminated
  2. Erratic engine performance
  3. Loss of power
  4. Rough idling
  5. Poor fuel efficiency

How to Fix U007D

  1. Perform a thorough diagnostic scan to identify the specific control module or wiring issue causing the communication problem.
  2. Inspect the wiring harness for any signs of damage, corrosion, or poor connections.
  3. Test the control modules involved in the low-speed extension CAN bus system for proper functionality.
  4. Repair or replace any faulty control modules or wiring components as needed.
  5. Clear the DTC and perform a test drive to ensure the issue has been resolved.

Cost to Fix U007D

The typical repair costs for addressing the U007D code can vary depending on the specific cause of the issue and the extent of repairs needed. In general, repairing wiring issues or replacing faulty control modules can range from $200 to $800, including parts and labor. However, it's essential to consider that diagnostic time and labor rates can vary significantly between auto repair shops. Rates typically range from $80 to $150 per hour, but may be higher in metropolitan areas or at dealerships, and lower at independent shops. It is advisable to obtain quotes from local shops for a more accurate estimate.

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Code U007D Information for Specific Makes

  • U007D Buick — Control Module Communication Low Speed Extension CAN Bus Off
  • U007D Cadillac — Control Module Communication Low Speed Extension CAN Bus Off
  • U007D Chevrolet — Control Module Communication Low Speed Extension CAN Bus Off
  • U007D GMC — Control Module Communication Low 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 U007D Code

1. What are the common symptoms of OBDII code U007D?

The common symptoms of OBDII code U007D include issues with various control modules communicating with each other, resulting in limited or no functionality of certain vehicle systems.

2. What are the possible causes of OBDII code U007D?

Possible causes of OBDII code U007D include a faulty control module, poor electrical connections, damaged wiring harness, or issues with the Controller Area Network (CAN) bus communication system.

3. How can I diagnose OBDII code U007D?

Diagnosing OBDII code U007D typically involves using a diagnostic scanner to retrieve the trouble codes and then performing a thorough inspection of the control modules, wiring, and connections associated with the affected systems.

4. Can OBDII code U007D be fixed without professional help?

Depending on the underlying cause, some simple repairs like checking and fixing loose connections or replacing damaged wiring may be possible without professional help. However, more complex issues may require the expertise of a mechanic.

5. Is it safe to continue driving with OBDII code U007D present?

It is not recommended to continue driving with OBDII code U007D present, as it can lead to further damage to the vehicle's control modules and systems. It is best to address the issue promptly to prevent more significant problems.

6. How much does it typically cost to repair OBDII code U007D?

The cost to repair OBDII code U007D can vary depending on the specific cause of the issue and the required repairs. Costs may range from a simple fix like tightening connections to more complex repairs involving control module replacement.

7. Are there any preventive measures to avoid OBDII code U007D in the future?

Regular maintenance, such as checking and cleaning electrical connections, inspecting wiring harnesses for damage, and addressing any communication system issues promptly, can help prevent OBDII code U007D from occurring.

8. Can a DIY enthusiast troubleshoot and fix OBDII code U007D?

DIY enthusiasts with a good understanding of automotive systems and access to diagnostic tools may be able to troubleshoot and fix OBDII code U007D, especially if the issue is related to simple fixes like loose connections or damaged wiring.

9. How long does it take to repair OBDII code U007D?

The repair time for OBDII code U007D can vary depending on the complexity of the issue and the expertise of the person performing the repairs. Simple fixes may take a short time, while more involved repairs could take longer.

10. Will resetting the OBDII code U007D make it go away permanently?

Resetting the OBDII code U007D may temporarily clear the code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is essential to diagnose and fix the root cause of the problem for a permanent solution.

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