AutoCodes – GMC – U179C 2016 GMC Sierra

U179C 2016 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

Quick Answer

The Hybrid/EV Powertrain Control Module 2 communicates with the Hybrid/EV Battery Interface Control Modules via a dedicated bus inside the Hybrid/EV Battery Pack assembly. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module 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: U179C 2016 GMC Sierra indicates Lost Communication with One or More Hybrid/EV Battery Interface Control Modules.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module 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 185

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 U179C 2016 GMC Sierra Description

The Hybrid/EV Powertrain Control Module 2 communicates with the Hybrid/EV Battery Interface Control Modules via a dedicated bus inside the Hybrid/EV Battery Pack assembly. This dedicated bus does not communicate with the scan tool. The Diagnostic Trouble Code (DTC) will be set when the Hybrid/EV Powertrain Control Module has received too many transmit errors on the dedicated serial data circuits.

OBDII Code U179C 2016 GMC Sierra - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules - AutoCodes.com — U179C 2016 GMC Sierra Code - Lost Communication with One or More Hybrid/EV Battery Interface Control Modules

What does this mean?

What are the Possible Causes of the DTC U179C 2016 GMC Sierra?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC U179C 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 U179C 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 U179C 2016 GMC Sierra code?

Need more information on how to fix the U179C 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 2016 GMC Sierra Code

1. What does the OBDII code U179C mean on a 2016 GMC Sierra?

The U179C code indicates a loss of communication with one or more hybrid/EV battery interface control modules, which are responsible for managing battery performance.

2. What are common symptoms of the U179C code on a GMC Sierra?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited power mode, or issues with the hybrid/EV system performance.

3. What causes the U179C code to appear on a 2016 GMC Sierra?

The code is typically caused by wiring issues, faulty connections, a malfunctioning battery interface control module, or a software problem within the vehicle's communication network.

4. Can a bad battery cause the U179C code?

Yes, a failing or degraded hybrid/EV battery may disrupt communication with the control module, triggering the U179C code.

5. How do I diagnose the U179C code on my 2016 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion. Use a scan tool to check for additional codes and monitor the communication network for faults.

6. Can I drive my 2016 GMC Sierra with the U179C code?

Itâ€™s not recommended, as this code could affect the hybrid/EV system's performance and potentially lead to further damage or reduced safety.

7. What repairs are typically needed for the U179C code?

Repairs may include fixing damaged wiring, cleaning or reconnecting loose connectors, updating software, or replacing the faulty battery interface control module.

8. How much does it cost to fix the U179C code on a GMC Sierra?

Repair costs can vary, ranging from $100 for minor wiring fixes to over $1,000 for module replacement, depending on the extent of the problem.

9. Can a software update resolve the U179C code?

In some cases, a software update may fix communication issues related to this code if the problem is caused by outdated or corrupted programming.

10. Does the U179C code require professional repair?

While basic inspections can be done at home, diagnosing and repairing network communication issues often require specialized tools and expertise, so consulting a professional is recommended.