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Engine-Codes – GMC – U007C 2018 GMC Sierra

U007C 2018 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus 2 Off

Quick Answer

The U007C diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus 2. Common causes include Wiring Harness Issues: Damage to the wiring harness connecting the control modules can disrupt communication on the CAN bus, Faulty Connectors: Loose or corroded connectors between modules can lead to poor communication and trigger the U007C code, Defective Control Modules: A malfunctioning control module can cause communication errors and trigger the U007C code. 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
U007C 2018 GMC Sierra indicates Control Module Communication High Speed Extension CAN Bus 2 Off.
Common causes
Common causes include Wiring Harness Issues: Damage to the wiring harness connecting the control modules can disrupt communication on the CAN bus, Faulty Connectors: Loose or corroded connectors between modules can lead to poor communication and trigger the U007C code, Defective Control Modules: A malfunctioning control module can cause communication errors and trigger the U007C code.
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 U007C 2018 GMC Sierra Description

The U007C diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Control Module Communication High Speed Extension CAN Bus 2. This code specifically points to a communication issue within the vehicle's network of control modules. The Controller Area Network (CAN) bus system is responsible for facilitating communication between various modules in the vehicle, allowing them to exchange data and commands. In this case, the high-speed extension CAN Bus 2 is experiencing a disruption or loss of communication, which can have significant implications for the vehicle's performance and functionality.

OBDII Code U007C 2018 GMC Sierra - Control Module Communication High Speed Extension CAN Bus 2 Off
U007C 2018 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus 2 Off

Common Causes of U007C 2018 GMC Sierra

  1. Wiring Harness Issues: Damage to the wiring harness connecting the control modules can disrupt communication on the CAN bus.
  2. Faulty Connectors: Loose or corroded connectors between modules can lead to poor communication and trigger the U007C code.
  3. Defective Control Modules: A malfunctioning control module can cause communication errors and trigger the U007C code.
  4. Water Intrusion: Water entering the vehicle's electronic components can lead to corrosion and communication issues on the CAN bus.
  5. Electrical Interference: External factors such as electromagnetic interference can disrupt communication signals and trigger the U007C code.

Symptoms of U007C 2018 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the U007C code is the illumination of the Check Engine Light on the dashboard.
  2. Erratic Behavior: The vehicle may exhibit erratic behavior such as stalling, rough idling, or hesitation during acceleration.
  3. Loss of Power: The engine may experience a loss of power or reduced performance due to communication issues between control modules.
  4. Transmission Problems: Issues with shifting gears or transmission performance may occur as a result of the U007C code.
  5. Inoperative Systems: Certain vehicle systems such as ABS, traction control, or airbags may become inoperative or malfunction due to communication failures.

How to Fix U007C 2018 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the U007C code and perform a thorough inspection of the wiring harness, connectors, and control modules.
  2. Repair or Replace Wiring: Repair any damaged wiring or connectors, or replace them if necessary to restore proper communication on the CAN bus.
  3. Test Control Modules: Test the control modules for proper functionality and replace any faulty modules that are causing communication issues.
  4. Clear Codes: Clear the DTC codes from the vehicle's system using the diagnostic scanner after completing the repairs to reset the Check Engine Light.
  5. Perform Road Test: Take the vehicle for a test drive to ensure that the communication issues have been resolved and that all systems are functioning properly.

Cost to Fix U007C 2018 GMC Sierra

The typical repair costs for addressing the U007C code on a 2018 GMC Sierra can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of repairing wiring harnesses, connectors, or control modules can range from $200 to $800 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the diagnosis time and labor rates can vary based on the location, vehicle make and model, and the complexity of the repair. It's advisable to consult with a professional mechanic or dealership to get a more accurate estimate based on the specific circumstances of the 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 U007C 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code U007C in a 2018 GMC Sierra?

The common symptoms of code U007C in a 2018 GMC Sierra include issues with the vehicle's communication systems, such as erratic or failed communication between control modules, warning lights on the dashboard, and possible drivability problems.

2. What does OBDII code U007C 'Control Module Communication High Speed Extension CAN Bus 2 Off' mean for a 2018 GMC Sierra?

Code U007C indicates a loss of communication or a fault in the high-speed CAN Bus network extension for Control Module Communication in a 2018 GMC Sierra.

3. What are the potential causes of OBDII code U007C in a 2018 GMC Sierra?

Common causes of code U007C in a 2018 GMC Sierra include wiring issues, faulty control modules, loose connections, damaged CAN Bus circuits, or software malfunctions within the vehicle's communication systems.

4. How can I diagnose OBDII code U007C in my 2018 GMC Sierra?

Diagnosing code U007C involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connections related to the high-speed CAN Bus network, checking for loose connections, and performing tests on the control modules and communication circuits.

5. Is it safe to drive my 2018 GMC Sierra with OBDII code U007C present?

It is not recommended to drive your 2018 GMC Sierra with code U007C present, as it can potentially cause communication issues between critical control modules and affect the vehicle's performance and safety systems.

6. Can OBDII code U007C in a 2018 GMC Sierra be repaired at home?

Repairing code U007C in a 2018 GMC Sierra may require advanced diagnostic tools and technical knowledge. While simple fixes like checking connections can be done at home, resolving complex issues with control modules or wiring may require professional assistance.

7. How much does it typically cost to repair OBDII code U007C in a 2018 GMC Sierra?

The cost of repairing code U007C in a 2018 GMC Sierra can vary depending on the underlying cause. Simple fixes like reconnecting wires may be inexpensive, while replacing faulty control modules or repairing damaged wiring can be more costly.

8. Can resetting the OBDII code U007C in a 2018 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing code U007C is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent the code from coming back.

9. Are there any preventive measures to avoid OBDII code U007C in a 2018 GMC Sierra?

Regular maintenance, checking the vehicle's wiring and connections, and addressing any communication system issues promptly can help prevent OBDII code U007C from occurring in a 2018 GMC Sierra.

10. How does OBDII code U007C affect the performance of a 2018 GMC Sierra?

Code U007C can impact the performance of a 2018 GMC Sierra by disrupting communication between control modules, potentially causing drivability issues, warning lights, and malfunctions in various vehicle systems that rely on proper communication between components.

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