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Engine-Codes – GMC – U179C 2017 GMC Sierra

U179C 2017 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

Quick Answer

The U179C code on a 2017 GMC Sierra indicates that there has been a communication failure with one or more hybrid/EV battery interface control modules. Common causes include Faulty hybrid/EV battery interface control module, Wiring harness issues or loose connections, Software malfunction in the control module. 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
U179C 2017 GMC Sierra indicates Lost Communication with One or More Hybrid/EV Battery Interface Control Modules.
Common causes
Common causes include Faulty hybrid/EV battery interface control module, Wiring harness issues or loose connections, Software malfunction in the control module.
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 11, 2024
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Code U179C 2017 GMC Sierra Description

The U179C code on a 2017 GMC Sierra indicates that there has been a communication failure with one or more hybrid/EV battery interface control modules. In hybrid and electric vehicles, these control modules play a crucial role in managing the interaction between the vehicle's battery and the rest of the electrical system. When communication is lost with these modules, it can result in a variety of performance issues and potentially even render the vehicle inoperable.

OBDII Code U179C 2017 GMC Sierra - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules
U179C 2017 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

Common Causes of U179C 2017 GMC Sierra

  1. Faulty hybrid/EV battery interface control module
  2. Wiring harness issues or loose connections
  3. Software malfunction in the control module
  4. Communication network problems within the vehicle
  5. Electrical system interference from aftermarket modifications

Symptoms of U179C 2017 GMC Sierra

  1. Loss of power or reduced acceleration
  2. Check engine light illuminated on the dashboard
  3. Inability to start the vehicle
  4. Erratic or unusual behavior from the hybrid or electric drivetrain
  5. Issues with regenerative braking functionality

How to Fix U179C 2017 GMC Sierra

  1. Perform a thorough diagnostic scan to identify the specific control module or wiring issue causing the communication failure.
  2. Inspect the wiring harness for any damage or loose connections and repair or replace as necessary.
  3. Update the software in the affected control module to address any glitches or bugs.
  4. Test the vehicle to ensure proper communication is restored and that all systems are functioning correctly.
  5. Clear the diagnostic trouble codes and reset the vehicle's computer to complete the repair process.

Cost to Fix U179C 2017 GMC Sierra

The typical repair costs for addressing a lost communication issue with hybrid/EV battery interface control modules can vary depending on the exact cause of the problem. Parts such as a new control module or wiring harness repairs may range from $200 to $800, while labor costs can add an additional $100 to $300 or more. Overall, the total repair cost for this issue could be anywhere from $300 to $1100, depending on the extent of the repairs needed. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the specific repair shop used.

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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 U179C 2017 GMC Sierra Code

1. What does OBDII code U179C mean on a 2017 GMC Sierra?

Code U179C indicates a "Lost Communication with One or More Hybrid/EV Battery Interface Control Modules," meaning there’s an issue with data exchange between the main control module and a hybrid/EV battery interface module.

2. What are the common symptoms of code U179C on a 2017 GMC Sierra?

Symptoms may include a check engine light, reduced hybrid/EV system performance, limited power mode, or inoperative hybrid functionality.

3. What causes the U179C code to appear on a GMC Sierra?

Common causes include a faulty hybrid/EV battery interface control module, damaged wiring or connectors, software glitches, or communication bus issues.

4. Can a U179C code cause drivability issues?

Yes, it can lead to reduced power, limited EV mode functionality, or complete failure of the hybrid system, depending on the severity of the issue.

5. How do you diagnose a U179C code on a 2017 GMC Sierra?

Diagnosis involves checking for additional codes, inspecting the wiring and connectors for damage, testing the battery interface control module, and ensuring proper communication on the CAN bus network.

6. Can a software update fix the U179C code?

In some cases, a software update to the control module can resolve communication errors, but this depends on the specific cause of the issue.

7. Is it safe to drive a 2017 GMC Sierra with a U179C code?

Driving may be possible but not recommended, as it could lead to reduced performance or further damage to the hybrid/EV system.

8. How much does it cost to repair a U179C code on a GMC Sierra?

Repair costs vary widely but may include diagnostic fees, wiring repairs, or module replacement, typically ranging from $200 to over $1,000 depending on the issue.

9. Can a loose connection cause the U179C code?

Yes, a loose or corroded connector in the hybrid/EV battery interface control module circuit can trigger this code.

10. What tools are needed to troubleshoot a U179C code?

A professional-grade scan tool capable of reading hybrid/EV-specific codes, a multimeter for electrical testing, and access to the vehicle’s wiring diagrams are essential for diagnosis.

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