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U007E 2015 GMC Sierra Code - Control Module Communication FlexRay 1A Bus Off

Quick Answer

The U007E diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Control Module Communication FlexRay 1A Bus being off. Common causes include Faulty control module within the FlexRay network, Wiring harness issues, such as damaged or corroded wires, Loose or poor connections within the communication network. 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 2015 GMC Sierra indicates Control Module Communication FlexRay 1A Bus Off.
Common causes
Common causes include Faulty control module within the FlexRay network, Wiring harness issues, such as damaged or corroded wires, Loose or poor connections within the communication network.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code U007E 2015 GMC Sierra Description

The U007E diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Control Module Communication FlexRay 1A Bus being off. The FlexRay communication system is a high-speed data bus used in modern vehicles to facilitate communication between various control modules. When this code is triggered, it means that there is a communication problem within the FlexRay network, specifically on Bus 1A. This can lead to a loss of communication between critical control modules, affecting the vehicle's performance and functionality.

OBDII Code U007E 2015 GMC Sierra - Control Module Communication FlexRay 1A Bus Off
U007E 2015 GMC Sierra Code - Control Module Communication FlexRay 1A Bus Off

Common Causes of U007E 2015 GMC Sierra

  1. Faulty control module within the FlexRay network.
  2. Wiring harness issues, such as damaged or corroded wires.
  3. Loose or poor connections within the communication network.
  4. Water or moisture intrusion causing electrical issues.
  5. Software glitches or programming errors affecting communication protocols.

Symptoms of U007E 2015 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Loss of communication with various control modules.
  3. Erratic behavior of vehicle systems, such as transmission shifting irregularities.
  4. Inability to access certain functions through the vehicle's interface.
  5. Reduced fuel efficiency or performance due to compromised communication between systems.

How to Fix U007E 2015 GMC Sierra

  1. Perform a comprehensive diagnostic scan to retrieve the specific DTC and pinpoint the affected control module.
  2. Inspect the wiring harness and connections for any visible damage or corrosion.
  3. Test the control modules within the FlexRay network for proper functionality.
  4. Address any identified issues, such as replacing faulty modules, repairing wiring, or securing loose connections.
  5. Clear the DTC and perform a test drive to ensure proper communication and functionality between modules.

Cost to Fix U007E 2015 GMC Sierra

The typical repair costs for addressing a U007E code on a 2015 GMC Sierra can vary depending on the exact cause of the issue. In general, the cost of parts and labor for this repair could range from $200 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's advisable to consult with a trusted mechanic or dealership to get a more accurate estimate based on your specific circumstances.

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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 U007E 2015 GMC Sierra Code

1. What does the OBDII code U007E for a 2015 GMC Sierra mean?

The code U007E indicates a Control Module Communication FlexRay 1A Bus Off error in the vehicle's communication network.

2. What are common symptoms of the U007E code in a 2015 GMC Sierra?

Common symptoms of the U007E code may include communication issues between control modules, warning lights on the dashboard, loss of certain vehicle functions, and possible stalling.

3. What can cause the U007E code to appear in a 2015 GMC Sierra?

Causes of the U007E code may include damaged wiring or connectors in the FlexRay communication network, faulty control modules, software issues, or a weak battery.

4. How can I diagnose the U007E code in my 2015 GMC Sierra?

Diagnosing the U007E code typically involves using a diagnostic scanner to check for additional trouble codes, inspecting the vehicle's wiring and connectors, testing the control modules, and verifying battery voltage.

5. Can I still drive my 2015 GMC Sierra with the U007E code present?

It is not recommended to drive your vehicle with the U007E code active, as it may lead to further issues or potential safety hazards. It is best to address the problem promptly.

6. How do I repair the U007E code in my 2015 GMC Sierra?

Repairing the U007E code may involve repairing or replacing damaged wiring, connectors, or control modules, updating software, and ensuring proper battery voltage.

7. Is it possible to clear the U007E code in a 2015 GMC Sierra without fixing the root cause?

Clearing the U007E code without addressing the underlying issue is not advised, as the problem may persist and trigger the code again. It is best to fix the root cause of the code.

8. Can a DIY enthusiast fix the U007E code in a 2015 GMC Sierra?

While some basic diagnostics and checks can be done by DIY enthusiasts, resolving the U007E code may require specialized equipment and expertise. It is recommended to seek professional help for proper diagnosis and repair.

9. How much can I expect to pay for repairing the U007E code in my 2015 GMC Sierra?

The cost of repairing the U007E code can vary depending on the specific cause of the issue, parts needed, and labor charges. It is advisable to get quotes from reputable mechanics or dealerships.

10. How can I prevent the U007E code from reoccurring in my 2015 GMC Sierra?

To prevent the U007E code from reoccurring, regular maintenance, checking the vehicle's electrical connections, ensuring proper battery health, and addressing any related issues promptly can help maintain a healthy communication network in the vehicle.

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