AutoCodes – Chevrolet – U179A Chevrolet

U179A Chevrolet 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 Chevrolet 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 1,955

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

What does this mean?

What are the Possible Causes of the DTC U179A Chevrolet?

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 Chevrolet?

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 Chevrolet 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.

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

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Information for Specific Chevrolet Models

U179A 2014 Chevrolet Silverado — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2015 Chevrolet Silverado — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2016 Chevrolet Silverado — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2017 Chevrolet Silverado — Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What does the OBDII code U179A mean on a Chevrolet?

The U179A code indicates a "Lost Communication with Hybrid/EV Powertrain Control Module 2," meaning the vehicle's systems are unable to communicate with this specific control module.

2. What are the common symptoms of the U179A code?

Symptoms can include a check engine light, reduced power mode, poor acceleration, hybrid/EV system malfunctions, or the vehicle failing to start.

3. What causes the U179A code to appear?

Common causes include faulty wiring or connectors, a malfunctioning Hybrid/EV Powertrain Control Module 2, software glitches, or issues with the CAN (Controller Area Network) communication bus.

4. Can the U179A code cause drivability issues?

Yes, it can lead to reduced performance, limited electric drive functionality, or a complete failure of the hybrid/EV system.

5. How can I diagnose the U179A code on my Chevrolet?

A professional scan tool can be used to check for related codes, verify module communication, and inspect wiring and connectors for damage or corrosion.

6. Can a weak or failing battery cause the U179A code?

Yes, a weak 12V battery or issues with the high-voltage battery system can disrupt module communication and trigger this code.

7. How much does it cost to repair the U179A code?

Repair costs vary depending on the cause but can range from $150 for wiring fixes to over $1,000 for module replacement, plus labor.

8. Can I drive my Chevrolet with the U179A code?

Driving is generally not recommended, as the code could cause reduced performance or additional system failures, particularly in hybrid or EV systems.

9. How do I fix the U179A code?

Repairs may involve inspecting and repairing wiring, replacing faulty connectors, reprogramming the control module, or replacing the Hybrid/EV Powertrain Control Module 2.

10. Do I need to reprogram the module to fix the U179A code?

In some cases, reprogramming or updating the software for the Hybrid/EV Powertrain Control Module 2 may resolve the issue. Consult with a certified technician to confirm.