AutoCodes – Buick – U007B Buick

U007B Buick Code - Control Module Communication High 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: U007B Buick indicates Control Module Communication High 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 404

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 U007B Buick 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 U007B Buick - Control Module Communication High Speed Extension CAN Bus Off - AutoCodes.com — U007B Buick Code - Control Module Communication High Speed Extension CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U007B Buick?

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 U007B Buick?

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 U007B Buick 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.

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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 Buick Code

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

- Common symptoms include issues with the vehicle's transmission, erratic shifting, loss of power, and possibly illuminated warning lights on the dashboard.

2. What can cause the OBDII code U007B in a Buick?

- The code U007B typically indicates a problem with the high-speed extension CAN bus communication system, which can be caused by wiring issues, faulty control modules, or software malfunctions.

3. How can I diagnose the cause of the U007B code in my Buick?

- Diagnosing the U007B code usually involves checking the wiring harness for damage, inspecting control modules for faults, and using a diagnostic scanner to analyze communication between modules.

4. Is it safe to drive my Buick with the U007B code present?

- It is not recommended to drive your Buick with the U007B code present, as it can lead to transmission issues and other potential safety hazards. It's best to address the problem promptly.

5. Can I repair the U007B code in my Buick myself?

- Repairing the U007B code may require advanced diagnostic tools and expertise. While simple wiring issues can sometimes be addressed by DIY enthusiasts, it's recommended to consult a professional mechanic for accurate diagnosis and repair.

6. How much does it typically cost to repair the U007B code in a Buick?

- The cost of repairing the U007B code in a Buick can vary depending on the underlying cause of the issue. Repairs may range from a few hundred dollars for simple fixes to over a thousand dollars for more complex issues.

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

- Resetting the U007B code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to return. It's important to diagnose and repair the root cause of the problem.

8. Can a weak battery cause the U007B code to appear in a Buick?

- Yes, a weak or failing battery can sometimes trigger communication errors between control modules, leading to the U007B code. It's advisable to ensure the battery is in good condition as part of the diagnostic process.

9. How long does it take to repair the U007B code in a Buick?

- The time required to repair the U007B code can vary based on the specific issue causing the code and the expertise of the mechanic. Simple fixes may take a few hours, while complex repairs could require more time.

10. Are there any recalls or technical service bulletins related to the U007B code in Buick vehicles?

- It's recommended to check with your local Buick dealership or visit the National Highway Traffic Safety Administration website to see if there are any recalls or technical service bulletins related to the U007B code in your specific Buick model.