AutoCodes – GMC – U179A 2016 GMC Sierra

U179A 2016 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 2016 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 188

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2016 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 2016 GMC Sierra - Lost Communication with Hybrid/EV Powertrain Control Module 2 - AutoCodes.com — U179A 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the U179A 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code U179A in a 2016 GMC Sierra?

- Common symptoms include the check engine light illuminated on the dashboard, issues with the hybrid/EV powertrain, and potential drivability problems.

2. What does the OBDII code U179A mean for a 2016 GMC Sierra?

- The code U179A indicates a lost communication with Hybrid/EV Powertrain Control Module 2 in the vehicle.

3. What are some possible causes of the U179A trouble code in a 2016 GMC Sierra?

- Possible causes include wiring or connection issues, a faulty powertrain control module, software glitches, or a malfunctioning communication network.

4. How can I diagnose the U179A code in my 2016 GMC Sierra?

- Diagnosing the code may require using a professional OBDII scanner to retrieve the specific details of the communication loss and checking the relevant wiring and connections for any faults.

5. Can I still drive my 2016 GMC Sierra with the U179A trouble code?

- It is not recommended to drive the vehicle with the U179A code present, as it may lead to further damage or safety concerns related to the powertrain control module.

6. How can I repair the U179A code in my 2016 GMC Sierra?

- Repairing the code typically involves addressing the root cause, which may include fixing wiring issues, replacing faulty components, updating software, or resetting the communication network.

7. Is it necessary to visit a dealership for U179A code repairs on a 2016 GMC Sierra?

- While visiting a dealership with specialized technicians and equipment is recommended for complex issues, independent auto repair shops may also be able to diagnose and repair the U179A code.

8. Are there any recalls related to the U179A trouble code in a 2016 GMC Sierra?

- It is advisable to check with the manufacturer or authorized dealerships for any recall information related to the U179A code in the specific vehicle model and year.

9. How much does it typically cost to fix the U179A code in a 2016 GMC Sierra?

- The cost of repairs for the U179A code can vary depending on the underlying issue, parts needed, labor rates, and whether the repairs are done at a dealership or an independent repair shop.

10. Can the U179A trouble code be prevented in a 2016 GMC Sierra?

- While some causes of the U179A code may be unavoidable, regular maintenance, timely software updates, and addressing any electrical issues promptly can help prevent the recurrence of the code.