AutoCodes – GMC – U179A 2014 GMC Sierra

U179A 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection. 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 2014 GMC Sierra indicates Lost Communication with Hybrid/EV Powertrain Control Module 2.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module 2, Hybrid/EV Powertrain Control Module 2 harness is open or shorted, Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection.
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 209

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U179A 2014 GMC Sierra Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Codes (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of health message, detect its absence; those devices in turn set a DTC associated with the loss of state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC.

OBDII Code U179A 2014 GMC Sierra - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U179A 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

What does this mean?

What are the Possible Causes of the DTC U179A 2014 GMC Sierra?

Faulty Hybrid/EV Powertrain Control Module 2
Hybrid/EV Powertrain Control Module 2 harness is open or shorted
Hybrid/EV Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC U179A 2014 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 U179A 2014 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 U179A 2014 GMC Sierra code?

Need more information on how to fix the U179A 2014 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 U179A 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code U179A in a 2014 GMC Sierra?

The common symptoms include the check engine light illuminating, reduced fuel efficiency, loss of power, and potential drivability issues.

2. What does the OBDII code U179A "Lost Communication with Hybrid/EV Powertrain Control Module 2" mean for a 2014 GMC Sierra?

This code indicates a communication problem between the vehicle's onboard computer system and the hybrid/EV powertrain control module 2.

3. What are the possible causes of the U179A code in a 2014 GMC Sierra?

Possible causes include damaged wiring or connectors, a faulty hybrid/EV powertrain control module 2, software issues, or a weak battery.

4. How can I diagnose the U179A code in my 2014 GMC Sierra?

Diagnosing the code typically involves checking the wiring and connectors for damage, ensuring proper power supply to the control module, and using a diagnostic scanner to communicate with the module.

5. Can I still drive my 2014 GMC Sierra with the U179A code present?

It is not recommended to drive the vehicle with the U179A code present, as it can lead to performance issues and potential damage to the hybrid/EV powertrain system.

6. How should I repair the U179A code in my 2014 GMC Sierra?

Repairing the U179A code may involve repairing or replacing damaged wiring, connectors, or the hybrid/EV powertrain control module 2 as needed. It's best to consult a professional mechanic for an accurate diagnosis and repair.

7. Is resetting the check engine light enough to fix the U179A code in a 2014 GMC Sierra?

Simply resetting the check engine light will not fix the underlying issue causing the U179A code. Proper diagnosis and repair of the root cause are necessary to resolve the problem.

8. Can a DIY enthusiast fix the U179A code in a 2014 GMC Sierra?

While some basic checks like inspecting wiring and connectors can be done by a DIY enthusiast, diagnosing and repairing the U179A code may require specialized tools and expertise best handled by a professional mechanic.

9. How much does it typically cost to repair the U179A code in a 2014 GMC Sierra?

The cost of repairing the U179A code can vary depending on the exact cause of the issue and the needed repairs. It's advisable to obtain a diagnostic evaluation from a qualified mechanic to determine the cost accurately.

10. How urgent is it to address the U179A code in a 2014 GMC Sierra?

It is important to address the U179A code promptly to prevent further potential damage to the hybrid/EV powertrain system and ensure the vehicle operates safely and efficiently.