AutoCodes – Buick – U007F Buick

U007F Buick 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 Buick 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.

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Code Popularity 215

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

What does this mean?

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

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

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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 U007F Buick Code

What does the OBDII code U007F mean in a Buick?

U007F indicates a communication issue on the FlexRay 1B bus, which is a high-speed network used by control modules to exchange data.

What are common symptoms of code U007F in a Buick?

Symptoms may include warning lights on the dashboard, loss of communication between control modules, or erratic vehicle behavior like reduced performance.

What causes the U007F code in a Buick?

The code can be triggered by faulty wiring, damaged FlexRay connectors, failed control modules, or electromagnetic interference affecting the bus network.

Can a weak battery or alternator cause the U007F code?

Yes, insufficient voltage can disrupt communication on the FlexRay bus, potentially triggering the U007F code.

How do you diagnose the U007F code in a Buick?

Technicians use an advanced scan tool to check for communication faults, inspect wiring and connectors, and test the affected modules for proper operation.

Can the U007F code affect vehicle drivability?

Yes, depending on the affected control modules, the vehicle may experience reduced performance, safety system malfunctions, or enter a limp mode.

Is replacing a control module always necessary to fix code U007F?

Not always. The issue could be related to wiring or connector damage, so thorough diagnosis is essential before replacing any components.

Can dirty or corroded connectors cause the U007F code?

Yes, corroded or dirty connectors can disrupt the FlexRay bus communication and trigger the U007F code.

Is it safe to drive a Buick with the U007F code active?

Driving with this code active may not be safe, as it can affect critical systems like braking or steering. It's best to have it addressed promptly.

How much does it typically cost to repair the U007F code in a Buick?

Repair costs vary based on the root cause, but they can range from $100 for minor wiring repairs to over $1,000 if a control module needs replacement.