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U007D 2014 GMC Sierra Code - Control Module Communication Low Speed Extension CAN Bus Off

Quick Answer

The U007D diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Control Module Communication Low Speed Extension CAN Bus being off. Common causes include Damaged wiring harnesses or connectors affecting the communication network, Faulty control modules not sending or receiving signals properly, Corrosion or moisture affecting the CAN bus connections. 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
U007D 2014 GMC Sierra indicates Control Module Communication Low Speed Extension CAN Bus Off.
Common causes
Common causes include Damaged wiring harnesses or connectors affecting the communication network, Faulty control modules not sending or receiving signals properly, Corrosion or moisture affecting the CAN bus connections.
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 17, 2024
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Code U007D 2014 GMC Sierra Description

The U007D diagnostic trouble code for a 2014 GMC Sierra indicates a problem with the Control Module Communication Low Speed Extension CAN Bus being off. The Controller Area Network (CAN) bus is a communication network that allows various control modules within the vehicle to communicate with each other. The low-speed extension of the CAN bus is responsible for transmitting data between modules at a lower speed than the high-speed network.

OBDII Code U007D 2014 GMC Sierra - Control Module Communication Low Speed Extension CAN Bus Off
U007D 2014 GMC Sierra Code - Control Module Communication Low Speed Extension CAN Bus Off

Common Causes of U007D 2014 GMC Sierra

  1. Damaged wiring harnesses or connectors affecting the communication network.
  2. Faulty control modules not sending or receiving signals properly.
  3. Corrosion or moisture affecting the CAN bus connections.
  4. Electrical issues such as short circuits or voltage irregularities.
  5. Software glitches or programming errors within the control modules.

Symptoms of U007D 2014 GMC Sierra

  1. Dashboard warning lights, such as the check engine light or communication error indicators.
  2. Loss of functionality in certain vehicle systems, such as power windows, door locks, or climate control.
  3. Erratic behavior of the transmission, engine, or other control modules.
  4. Vehicle going into limp mode or reduced performance.

How to Fix U007D 2014 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harnesses, connectors, and control modules related to the low-speed CAN bus.
  2. Use a diagnostic scanner to retrieve and clear the trouble code, then monitor the system for any recurring issues.
  3. Check for any loose connections or corrosion on the CAN bus network and address them accordingly.
  4. Test the control modules for proper functionality and replace any faulty units if necessary.
  5. Perform a software update or reprogramming of the control modules to ensure proper communication.

Cost to Fix U007D 2014 GMC Sierra

The typical repair costs for addressing a U007D code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. On average, the 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 recommended 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 U007D 2014 GMC Sierra Code

What does the OBDII code U007D mean for my 2014 GMC Sierra?

The OBDII code U007D indicates a communication issue within the low-speed extension of the Controller Area Network (CAN) bus, meaning that the control modules are not communicating as expected.

What symptoms might I notice if my GMC Sierra has the U007D code?

Common symptoms include warning lights on the dashboard, erratic behavior of electronic components, loss of functionality in certain systems, and potential engine performance issues.

What could cause the U007D code to trigger in my vehicle?

Possible causes include damaged wiring or connectors in the CAN bus, faulty control modules, or issues with the vehicle's electrical system, such as low voltage.

Is it safe to drive my GMC Sierra with the U007D code?

While it may be safe to drive short distances, it's advisable to have the issue diagnosed and repaired as it can lead to more serious problems with vehicle systems.

How can I diagnose the U007D code accurately?

To diagnose the code, use an OBDII scanner to confirm the code, then inspect wiring and connectors for damage, check for other related codes, and test the functionality of control modules.

What are some common repairs for a U007D code in a GMC Sierra?

Common repairs include repairing or replacing damaged wiring and connectors, updating or reprogramming control modules, and ensuring proper grounding and voltage levels in the electrical system.

Can the U007D code clear itself?

In some cases, if the issue is intermittent, the code may clear itself after a few drive cycles without any further problems, but it's important to address the root cause to prevent it from returning.

Should I reset the code after repairs?

Yes, after addressing the underlying issue, you should clear the code using an OBDII scanner and then monitor the vehicle to ensure the code does not return.

Are there any specific tools needed to diagnose the U007D code?

A standard OBDII scanner is essential for reading and clearing codes, but additional tools like a multimeter may be needed to test wiring and connections for continuity and voltage.

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