AutoCodes – GMC – U007C 2017 GMC Sierra

U007C 2017 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus 2 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: U007C 2017 GMC Sierra indicates Control Module Communication High Speed Extension CAN Bus 2 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 353

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U007C 2017 GMC Sierra 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 U007C 2017 GMC Sierra - Control Module Communication High Speed Extension CAN Bus 2 Off - AutoCodes.com — U007C 2017 GMC Sierra Code - Control Module Communication High Speed Extension CAN Bus 2 Off

What does this mean?

What are the Possible Causes of the DTC U007C 2017 GMC Sierra?

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 U007C 2017 GMC Sierra?

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 U007C 2017 GMC Sierra 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 U007C 2017 GMC Sierra code?

Need more information on how to fix the U007C 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2017 GMC Sierra Code

1. What does the OBDII code U007C mean on a 2017 GMC Sierra?

The U007C code indicates a communication issue on the high-speed CAN Bus 2 network, specifically that the communication is off or disrupted.

2. What are the common symptoms of code U007C on a GMC Sierra?

Symptoms may include warning lights on the dashboard, loss of communication with certain modules, intermittent electrical issues, or even failure of certain vehicle systems like ABS or traction control.

3. What causes the U007C code to appear?

Common causes include damaged wiring or connectors in the CAN Bus 2 network, a malfunctioning control module, a short or open circuit, or a failed communication module.

4. Can the U007C code cause drivability issues?

Yes, depending on the affected systems, it may lead to reduced functionality or complete failure of safety or performance features such as ABS, stability control, or powertrain management.

5. How do I diagnose the U007C code on my 2017 GMC Sierra?

Start by scanning all modules for additional codes, visually inspecting CAN Bus wiring and connectors, and testing for continuity and resistance in the CAN Bus 2 circuit.

6. Is it safe to drive with the U007C code active?

It may not be safe, as the code can impact critical vehicle systems. Addressing the issue promptly is recommended to avoid further problems.

7. How can I fix the U007C code on my GMC Sierra?

Repairs may include cleaning or reconnecting wiring harnesses, repairing damaged wires, replacing faulty connectors, or replacing a malfunctioning control module.

8. Which modules are typically affected by the U007C code?

Modules such as the Engine Control Module (ECM), Transmission Control Module (TCM), or Body Control Module (BCM) may lose communication on the CAN Bus 2 network.

9. Can a low battery cause the U007C code on a 2017 GMC Sierra?

Yes, a weak or low battery can cause voltage fluctuations that disrupt communication on the CAN Bus network, triggering the U007C code.

10. Do I need a professional mechanic to fix the U007C code?

While some basic checks like inspecting wiring can be done at home, diagnosing and repairing CAN Bus issues often require specialized tools and expertise, so consulting a professional is advisable.