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U007D 2015 GMC Sierra Code - Control Module Communication Low Speed Extension CAN Bus Off

Quick Answer

The U007D diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the Control Module Communication Low Speed Extension CAN Bus being off. Common causes include Faulty control module on the low-speed extension CAN bus, Wiring or connection issues in the CAN bus network, Corrosion or damage to CAN bus connectors. 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 2015 GMC Sierra indicates Control Module Communication Low Speed Extension CAN Bus Off.
Common causes
Common causes include Faulty control module on the low-speed extension CAN bus, Wiring or connection issues in the CAN bus network, Corrosion or damage to CAN bus connectors.
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 16, 2024
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Code U007D 2015 GMC Sierra Description

The U007D diagnostic trouble code (DTC) for a 2015 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 modules in the vehicle to communicate with each other. The low-speed extension CAN bus is a specific part of this network that operates at a lower speed than the high-speed CAN bus.

OBDII Code U007D 2015 GMC Sierra - Control Module Communication Low Speed Extension CAN Bus Off
U007D 2015 GMC Sierra Code - Control Module Communication Low Speed Extension CAN Bus Off

Common Causes of U007D 2015 GMC Sierra

  1. Faulty control module on the low-speed extension CAN bus
  2. Wiring or connection issues in the CAN bus network
  3. Corrosion or damage to CAN bus connectors
  4. Software glitches or programming errors in control modules
  5. Electrical interference from aftermarket accessories or modifications

Symptoms of U007D 2015 GMC Sierra

  1. Check engine light illuminated on the dashboard
  2. Loss of communication with certain modules (e.g., ABS, airbag)
  3. Erratic behavior of vehicle systems (e.g., shifting issues, stalling)
  4. Reduced fuel efficiency
  5. Difficulty starting the vehicle

How to Fix U007D 2015 GMC Sierra

  1. Use a diagnostic scan tool to retrieve and record all trouble codes present in the vehicle's system.
  2. Inspect the wiring and connectors in the low-speed extension CAN bus network for any signs of damage, corrosion, or loose connections.
  3. Test the control modules on the CAN bus for proper operation and communication.
  4. Repair or replace any faulty control modules, wiring, or connectors as needed.
  5. Clear all trouble codes from the vehicle's system and perform a test drive to ensure the issue has been resolved.

Cost to Fix U007D 2015 GMC Sierra

The typical repair costs for addressing a U007D code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for replacing a faulty control module or repairing wiring/connectors can range from $200 to $800. Labor costs for diagnosis and repair can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total cost for resolving this issue may fall between $300 and $1100. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle.

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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 2015 GMC Sierra Code

1. What does the OBDII code U007D mean on a 2015 GMC Sierra?

It indicates a communication issue on the low-speed CAN (Controller Area Network) bus, specifically that the bus is "off," meaning data transmission is disrupted.

2. What are the common symptoms of a U007D code on a 2015 GMC Sierra?

Symptoms may include illuminated warning lights (e.g., check engine light), loss of communication with certain modules, non-functioning electrical components, or intermittent vehicle performance issues.

3. What causes the U007D code on a 2015 GMC Sierra?

Common causes include a faulty control module, damaged or corroded wiring, a short or open in the low-speed CAN circuit, or a bad connection at a module or bus line.

4. Is it safe to drive a 2015 GMC Sierra with a U007D code?

While the vehicle may still be drivable, the code can indicate critical communication issues, potentially leading to safety concerns. It's best to address the problem promptly.

5. How do you diagnose the U007D code on a 2015 GMC Sierra?

Diagnosis involves checking for other related codes, inspecting the wiring and connections on the low-speed CAN bus, and using a scan tool to monitor network communication.

6. Can a faulty battery cause the U007D code on a 2015 GMC Sierra?

Yes, a weak or failing battery or charging system can cause communication problems, including triggering the U007D code.

7. What modules are typically affected by the U007D code on a 2015 GMC Sierra?

Modules connected to the low-speed CAN bus, such as the Body Control Module (BCM) or other auxiliary control units, may be affected.

8. How can wiring issues trigger the U007D code on a 2015 GMC Sierra?

Damaged, corroded, or loose wiring can disrupt the communication on the low-speed CAN bus, leading to the code being set.

9. What repairs are commonly needed to fix the U007D code on a 2015 GMC Sierra?

Repairs may include fixing or replacing damaged wiring, cleaning or securing loose connections, replacing a faulty module, or addressing battery or alternator issues.

10. Can clearing the U007D code solve the problem on a 2015 GMC Sierra?

Clearing the code may temporarily turn off the warning light but won’t fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.

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