AutoCodes – GMC – U007C GMC

U007C GMC 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 GMC 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 1,604

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

What does this mean?

What are the Possible Causes of the DTC U007C GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the U007C GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

U007C 2014 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
U007C 2015 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
U007C 2016 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
U007C 2017 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 Off
U007C 2018 GMC Sierra — Control Module Communication High Speed Extension CAN Bus 2 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 U007C GMC Code

1. What does the OBDII code U007C mean for a GMC vehicle?

The code U007C indicates a communication issue on the high-speed CAN Bus 2 network, meaning one or more control modules are unable to communicate properly.

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

Symptoms can include warning lights on the dashboard (like the check engine light), reduced vehicle performance, erratic transmission behavior, or failure of certain vehicle systems to function.

3. What causes the U007C code to appear on a GMC?

Common causes include a faulty control module, damaged CAN Bus wiring, corroded or loose connectors, or a malfunctioning CAN Bus termination resistor.

4. How is the U007C code diagnosed in a GMC vehicle?

A technician will use a scan tool to check for related codes, inspect the CAN Bus wiring and connectors for damage, and test the communication between modules on the network.

5. Can a weak battery cause the U007C code in a GMC?

Yes, a weak or failing battery can result in insufficient voltage to the control modules, causing communication errors like the U007C code.

6. How do you fix the U007C code on a GMC?

Repairs may involve replacing or repairing damaged wiring, securing loose connectors, replacing a faulty control module, or reprogramming the affected module(s).

7. Is it safe to drive with the U007C code present in a GMC?

It depends on the severity of the issue. If critical systems like steering or brakes are affected, driving may be unsafe. It's best to address the issue promptly.

8. Can the U007C code clear itself on a GMC?

The code may clear temporarily if the issue is intermittent, but it will likely return unless the underlying problem is resolved.

9. How much does it cost to repair the U007C code in a GMC?

Repair costs vary depending on the cause, ranging from $50 for simple wiring fixes to $500 or more for module replacements or reprogramming.

10. Can a software update fix the U007C code in a GMC?

In some cases, a software update for the control module may resolve communication issues, but further diagnosis is required to determine if this is the solution.