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Engine-Codes – GMC – U179A 2015 GMC Sierra

U179A 2015 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Quick Answer

The U179A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. Common causes include Faulty wiring or connectors, Malfunctioning Hybrid/EV Powertrain Control Module 2, 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
U179A 2015 GMC Sierra indicates Lost Communication with Hybrid/EV Powertrain Control Module 2.
Common causes
Common causes include Faulty wiring or connectors, Malfunctioning Hybrid/EV Powertrain Control Module 2, 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 17, 2024
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Code U179A 2015 GMC Sierra Description

The U179A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Powertrain Control Module 2. This module is responsible for managing the hybrid or electric powertrain system in the vehicle. When communication is lost with this module, it can lead to a variety of performance issues and potentially impact the drivability of the vehicle.

OBDII Code U179A 2015 GMC Sierra - Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2015 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Common Causes of U179A 2015 GMC Sierra

  1. Faulty wiring or connectors
  2. Malfunctioning Hybrid/EV Powertrain Control Module 2
  3. Software glitches or programming errors
  4. Communication network issues within the vehicle
  5. Electrical interference or grounding problems

Symptoms of U179A 2015 GMC Sierra

  1. Loss of power or acceleration
  2. Reduced fuel efficiency
  3. Stalling or rough idling
  4. Warning lights illuminated on the dashboard
  5. Inability to switch between hybrid or electric modes

How to Fix U179A 2015 GMC Sierra

  1. Perform a thorough diagnostic scan to confirm the U179A code and identify the specific communication issue.
  2. Inspect wiring and connectors related to the Hybrid/EV Powertrain Control Module 2 for any damage or corrosion.
  3. Test the control module for proper functionality and communication.
  4. Update software or reprogram the control module if necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U179A 2015 GMC Sierra

The typical repair costs for addressing a communication issue with the Hybrid/EV Powertrain Control Module 2 can range from $200 to $600, depending on the exact cause of the problem and the cost of any necessary parts. This estimate includes both parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate tailored to your specific circumstances.

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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 U179A 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code U179A in a 2015 GMC Sierra?

- Common symptoms include the illumination of the check engine light, decreased fuel efficiency, and issues with the hybrid or electric powertrain system.

2. What does the OBDII code U179A indicate in a 2015 GMC Sierra?

- The code U179A signifies a communication error between the vehicle's onboard diagnostic system and the Hybrid/EV Powertrain Control Module 2.

3. What are the possible causes of the U179A trouble code in a 2015 GMC Sierra?

- Potential causes include wiring or connection issues between modules, a faulty Hybrid/EV Powertrain Control Module 2, or software communication errors.

4. How can I diagnose the U179A code in my 2015 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the wiring and connections related to the Hybrid/EV Powertrain Control Module 2, and performing a system reset.

5. What is the recommended repair approach for U179A in a 2015 GMC Sierra?

- Repair may involve addressing wiring issues, repairing or replacing faulty components, updating software, and resetting the system to clear the code.

6. Can I continue driving my 2015 GMC Sierra with the U179A code?

- It is not advisable to ignore the U179A code, as it can lead to further damage to the hybrid or electric powertrain system. It is recommended to address the issue promptly.

7. Is it safe to reset the U179A code in a 2015 GMC Sierra without repairing the underlying issue?

- While resetting the code may temporarily turn off the check engine light, it is crucial to identify and fix the root cause to prevent recurring issues with the powertrain system.

8. How much does it typically cost to repair the U179A code in a 2015 GMC Sierra?

- Repair costs can vary depending on the specific cause of the code, but they may range from a simple wiring fix to a more complex module replacement, potentially costing several hundred dollars.

9. Can a DIY enthusiast address the U179A trouble code in a 2015 GMC Sierra?

- DIY enthusiasts with automotive repair experience may be able to diagnose and address simple wiring issues related to the U179A code. However, complex repairs or module replacements may require professional assistance.

10. How can I prevent the U179A code from reoccurring in my 2015 GMC Sierra?

- Regularly maintaining your vehicle, ensuring proper wiring connections, and promptly addressing any related warning signs can help prevent the U179A code from reoccurring.

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