AutoCodes – GMC – U007F GMC

U007F GMC Code - Control Module Communication FlexRay 1B 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: U007F GMC indicates Control Module Communication FlexRay 1B 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 416

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U007F 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 U007F GMC - Control Module Communication FlexRay 1B Bus Off - AutoCodes.com — U007F GMC Code - Control Module Communication FlexRay 1B Bus Off

What does this mean?

What are the Possible Causes of the DTC U007F 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 U007F 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 U007F 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 U007F GMC code?

Need more information on how to fix the U007F GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U007F GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

U007F 2014 GMC Sierra — Control Module Communication FlexRay 1B Bus Off
U007F 2015 GMC Sierra — Control Module Communication FlexRay 1B Bus Off
U007F 2016 GMC Sierra — Control Module Communication FlexRay 1B Bus Off
U007F 2017 GMC Sierra — Control Module Communication FlexRay 1B 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 U007F GMC Code

What does the OBDII code U007F mean for GMC vehicles?

The U007F code indicates a communication failure on the FlexRay 1B bus, which is a high-speed communication network used between control modules in the vehicle.

What are the common symptoms of the U007F code in GMC vehicles?

Symptoms may include warning lights on the dashboard, such as the check engine or service light, loss of communication with certain modules, or intermittent electrical issues.

What causes the U007F code to appear in GMC vehicles?

Common causes include faulty wiring or connectors in the FlexRay 1B bus, a malfunctioning control module, or a software glitch in one of the networked modules.

Can I drive my GMC with the U007F code active?

While the vehicle may still be drivable, communication issues between modules could compromise performance or safety features, making it important to address the problem promptly.

How is the U007F code diagnosed?

A technician will use a scan tool to check for related codes, inspect the FlexRay wiring and connectors, and test the affected control modules for proper communication.

What repairs are typically needed to fix the U007F code?

Repairs may include fixing or replacing damaged wiring, cleaning or reconnecting loose connectors, updating module software, or replacing a faulty control module.

Can a dead battery cause the U007F code in GMC vehicles?

Yes, a dead or weak battery can disrupt communication on the FlexRay network, potentially triggering the U007F code.

Is the U007F code specific to GMC vehicles?

No, the U007F code can appear on other vehicles that use the FlexRay communication network, but its specific implications may vary by make and model.

How much does it cost to repair a U007F code on a GMC vehicle?

Repair costs vary depending on the root cause but can range from $100 for simple wiring repairs to over $1,000 if a control module replacement is necessary.

Can I fix the U007F code myself?

If you have experience with automotive electronics, you can inspect wiring and connectors for damage or loose connections. However, more complex issues like module reprogramming or replacement typically require professional tools and expertise.