AutoCodes – Generic – U007D

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

Quick Answer

The devices connected to the object high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Check for more codes, Faulty Control Module, Control Module harness is open or shorted. 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 Check for more codes, Faulty Control Module, Control Module harness is open or shorted.
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.

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Code Popularity 1,235

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U007D Description

The devices connected to the object high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices when the ignition switch is in any position other than OFF. The object high speed GMLAN serial data bus uses terminating resistors that are in parallel with the object high speed GMLAN (+) and (-) circuits. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U007D - Control Module Communication Low Speed Extension CAN Bus Off - AutoCodes.com — U007D Code - Control Module Communication Low Speed Extension CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U007D?

Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U007D?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U007D code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U007D code?

Need more information on how to fix the U007D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U007D code diagnosed by a professional: Find a repair shop in your area

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.