AutoCodes – Generic – U007E

U007E Code - Control Module Communication FlexRay 1A 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: U007E indicates Control Module Communication FlexRay 1A 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 308

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 U007E 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 U007E - Control Module Communication FlexRay 1A Bus Off - AutoCodes.com — U007E Code - Control Module Communication FlexRay 1A Bus Off

What does this mean?

What are the Possible Causes of the DTC U007E?

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 U007E?

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 U007E 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 U007E code?

Need more information on how to fix the U007E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U007E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U007E Buick — Control Module Communication FlexRay 1A Bus Off
U007E Cadillac — Control Module Communication FlexRay 1A Bus Off
U007E Chevrolet — Control Module Communication FlexRay 1A Bus Off
U007E GMC — Control Module Communication FlexRay 1A 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 U007E Code

What does the OBDII code U007E mean?

The code U007E indicates a communication issue on the FlexRay 1A bus, where a control module has lost communication or is unable to transmit data.

What are common symptoms of the U007E code?

Symptoms may include illuminated warning lights, trouble starting the vehicle, malfunctioning electronic systems, or reduced performance of advanced features such as adaptive cruise control.

What causes the U007E code?

This code is typically caused by wiring issues, damaged connectors, a malfunctioning control module, or interference in the FlexRay network.

Can the U007E code affect vehicle drivability?

Yes, in some cases, it can impact drivability if the affected module controls critical systems like the engine or transmission.

How do I diagnose the U007E code?

Diagnosis involves using a scan tool to confirm the code, inspecting the FlexRay wiring and connectors for damage, and testing the affected control modules for proper operation.

Can I clear the U007E code without repairs?

Clearing the code without addressing the root cause may temporarily remove the warning, but the problem will likely return until the issue is resolved.

What should I check first when troubleshooting the U007E code?

Start by inspecting the FlexRay wiring and connectors for corrosion, damage, or loose connections, as these are common causes.

Is the U007E code specific to certain vehicle brands?

No, the U007E code is not brand-specific and can appear in any vehicle equipped with a FlexRay communication network.

How much does it cost to fix the U007E code?

Repair costs vary depending on the root cause but can range from fixing wiring issues ($50-$200) to replacing a control module ($500-$1,500).

Can a software update fix the U007E code?

In some cases, a software update may resolve compatibility issues or improve communication between modules, but this depends on the specific vehicle and problem.