AutoCodes – Buick – U007C Buick

U007C Buick Code - Control Module Communication High Speed Extension CAN Bus 2 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: U007C Buick indicates Control Module Communication High Speed Extension CAN Bus 2 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 315

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 U007C 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 U007C Buick - Control Module Communication High Speed Extension CAN Bus 2 Off - AutoCodes.com — U007C Buick Code - Control Module Communication High Speed Extension CAN Bus 2 Off

What does this mean?

What are the Possible Causes of the DTC U007C 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 U007C 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 U007C 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.

Need more information about the U007C Buick code?

Need more information on how to fix the U007C Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 U007C Buick Code

1. What does the OBDII code U007C mean on a Buick?

U007C indicates a communication issue on the high-speed CAN Bus 2 network, where one or more control modules cannot communicate properly.

2. What are common symptoms of code U007C in a Buick?

Symptoms may include a check engine light, erratic vehicle behavior, inoperative systems like ABS or traction control, or other warning lights on the dashboard.

3. What causes the U007C code on a Buick?

Common causes include damaged or loose CAN Bus wiring, a faulty control module, a failing CAN Bus communication connector, or a blown fuse.

4. Can a weak battery trigger the U007C code on a Buick?

Yes, a weak or failing battery can cause communication issues on the CAN Bus network and trigger the U007C code.

5. How do you diagnose the U007C code in a Buick?

Diagnosis involves checking the CAN Bus wiring for damage, inspecting connectors for corrosion or looseness, verifying module power and ground connections, and using a scan tool to identify the affected module.

6. Can driving with the U007C code damage my Buick?

Driving with this code may lead to impaired functionality of critical systems, potentially affecting safety. It's best to address the issue promptly.

7. How do you fix the U007C code on a Buick?

Repairs may include repairing or replacing damaged wiring, reconnecting loose connectors, replacing a faulty control module, or fixing blown fuses.

8. How much does it cost to fix the U007C code on a Buick?

Repair costs vary depending on the issue but can range from $100 for simple wiring fixes to $1,000 or more if a control module needs replacement.

9. Can I clear the U007C code without fixing the problem?

Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely return.

10. Do I need a professional to fix the U007C code on my Buick?

While some issues like checking connectors or fuses can be done by DIYers, diagnosing and repairing complex CAN Bus communication problems often requires professional tools and expertise.