AutoCodes – GMC – U179A GMC

U179A GMC 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 GMC 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 785

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

What does this mean?

What are the Possible Causes of the DTC U179A GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the U179A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

U179A 2014 GMC Sierra — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2015 GMC Sierra — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2016 GMC Sierra — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2017 GMC Sierra — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2018 GMC Sierra — Lost Communication with Hybrid/EV Powertrain Control Module 2

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 GMC Code

1. What are the common symptoms of OBDII code U179A GMC?

- Common symptoms include the hybrid/EV powertrain system not functioning properly, loss of power, warning lights illuminated on the dashboard, and issues with acceleration.

2. What could cause the OBDII code U179A GMC to trigger?

- The code U179A is typically triggered by a communication failure between the vehicle's onboard computer system and the hybrid/EV powertrain control module 2.

3. How can I diagnose the OBDII code U179A GMC?

- Diagnosing the code U179A requires using a professional OBDII scanner to read the fault codes stored in the vehicle's computer system and conducting a thorough inspection of the hybrid/EV powertrain components.

4. What are some potential repair tips for resolving the OBDII code U179A GMC?

- Repairing the U179A code may involve checking and repairing any damaged wiring or connectors related to the hybrid/EV powertrain control module 2, ensuring proper ground connections, and updating the vehicle's software if necessary.

5. Can I continue driving my vehicle with the OBDII code U179A GMC present?

- It is not recommended to drive the vehicle with the U179A code present, as it indicates a communication issue with the hybrid/EV powertrain control module 2, which can affect the vehicle's performance and safety.

6. How serious is the OBDII code U179A GMC?

- The U179A code is considered serious as it indicates a loss of communication with a critical component of the hybrid/EV powertrain system, which can impact the vehicle's overall operation and efficiency.

7. Will resetting the OBDII code U179A GMC make it go away permanently?

- Simply resetting the code without addressing the underlying communication issue will not make it go away permanently. Proper diagnosis and repair are necessary to resolve the U179A fault code.

8. Are there any recalls or technical service bulletins related to the OBDII code U179A GMC?

- It's recommended to check with the manufacturer or authorized service centers for any recalls or technical service bulletins related to the U179A code in your specific GMC vehicle model.

9. Can a DIY enthusiast fix the OBDII code U179A GMC at home?

- While some basic troubleshooting and repairs can be done at home, diagnosing and fixing the U179A code may require specialized tools and knowledge. It's advisable to consult a professional mechanic for proper diagnosis and repair.

10. How much does it typically cost to repair the OBDII code U179A GMC?

- The cost of repairing the U179A code can vary depending on the underlying cause, parts needed for replacement, labor costs, and whether the repair is done at a dealership or an independent mechanic. It's best to get a professional estimate for an accurate cost assessment.