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Engine-Codes – GMC – U179C 2014 GMC Sierra

U179C 2014 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

Quick Answer

The U179C diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication failure between the vehicle's onboard computer system and one or more Hybrid/EV (Electric Vehicle) Battery Interface Control Modules. Common causes include Wiring issues or damaged wiring harness, Faulty Hybrid/EV Battery Interface Control Modules, Software glitches or programming errors. 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 2014 GMC Sierra indicates Lost Communication with One or More Hybrid/EV Battery Interface Control Modules.
Common causes
Common causes include Wiring issues or damaged wiring harness, Faulty Hybrid/EV Battery Interface Control Modules, Software glitches or programming errors.
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 2014 GMC Sierra Description

The U179C diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that there is a communication failure between the vehicle's onboard computer system and one or more Hybrid/EV (Electric Vehicle) Battery Interface Control Modules. This code typically affects hybrid or electric vehicles, where the battery interface control modules play a crucial role in managing the flow of power between the battery pack and the vehicle's electric motor.

OBDII Code U179C 2014 GMC Sierra - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules
U179C 2014 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

Common Causes of U179C 2014 GMC Sierra

  1. Wiring issues or damaged wiring harness
  2. Faulty Hybrid/EV Battery Interface Control Modules
  3. Software glitches or programming errors
  4. Electrical issues within the system
  5. Water damage or corrosion in the electrical components

Symptoms of U179C 2014 GMC Sierra

  1. Loss of power or acceleration
  2. Reduced fuel efficiency
  3. Inability to switch between hybrid and electric modes
  4. Warning lights on the dashboard related to the hybrid or electric system
  5. Inability to charge the battery pack properly

How to Fix U179C 2014 GMC Sierra

  1. Perform a thorough visual inspection of the wiring harness and connectors for any signs of damage or corrosion.
  2. Use a diagnostic scan tool to communicate with the Hybrid/EV Battery Interface Control Modules and identify any specific error codes or communication issues.
  3. Check and update the software of the control modules if necessary.
  4. Test the battery pack and charging system to ensure proper functionality.
  5. Replace any faulty control modules or repair any wiring issues as needed.

Cost to Fix U179C 2014 GMC Sierra

The typical repair costs for addressing the U179C code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as control modules or wiring harnesses can range from $200 to $800, while labor costs can add an additional $100 to $400 to the total repair bill. Overall, the total cost for addressing this issue may range from $300 to $1200, but it's important to consult with a professional mechanic or dealership for a more accurate estimate based on the specific diagnosis and repair needs of the vehicle. Labor rates at auto repair shops can vary based on location and other factors, so it's advisable to inquire about rates beforehand.

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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 2014 GMC Sierra Code

1. What are common symptoms of OBDII code U179C in a 2014 GMC Sierra?

- Common symptoms include the check engine light illuminating, loss of communication with hybrid/EV battery interface control modules, and potential drivability issues.

2. What does the OBDII code U179C indicate in a 2014 GMC Sierra?

- The code U179C indicates a communication error between the vehicle's onboard diagnostic system and one or more hybrid/EV battery interface control modules.

3. What are possible causes of the U179C code in a 2014 GMC Sierra?

- Possible causes include damaged wiring or connectors, a faulty battery interface control module, software issues, or a malfunctioning onboard diagnostic system.

4. How can I diagnose the U179C code in my 2014 GMC Sierra?

- Diagnosing the U179C code typically involves checking the wiring and connectors for damage, testing the battery interface control module, and using a diagnostic scan tool to communicate with the affected modules.

5. Can I still drive my 2014 GMC Sierra with the U179C code?

- It is not recommended to continue driving the vehicle with the U179C code present, as it can potentially lead to drivability issues and further damage if left unaddressed.

6. How can I repair the U179C code in my 2014 GMC Sierra?

- Repairing the U179C code may involve fixing any damaged wiring or connectors, replacing the faulty battery interface control module, updating software as needed, or resetting the onboard diagnostic system.

7. Is the U179C code specific to hybrid or electric vehicles in a 2014 GMC Sierra?

- Yes, the U179C code specifically pertains to communication issues with hybrid/EV battery interface control modules, indicating a problem within the vehicle's hybrid or electric system.

8. Can a DIY enthusiast fix the U179C code in a 2014 GMC Sierra?

- While some simple checks like inspecting wiring and connectors can be done by DIY enthusiasts, diagnosing and repairing the U179C code may require specialized tools and expertise, so it is recommended to seek professional help.

9. How much does it cost to repair the U179C code in a 2014 GMC Sierra?

- The cost of repairing the U179C code can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs, so it's best to get a diagnostic evaluation from a trusted mechanic for an accurate estimate.

10. Will resetting the OBDII system clear the U179C code in a 2014 GMC Sierra?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the U179C code is not addressed and fixed, the code is likely to reappear after driving the vehicle again.

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