AutoCodes – Buick – U179A Buick

U179A Buick 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 Buick 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 793

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

What does this mean?

What are the Possible Causes of the DTC U179A Buick?

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 Buick?

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 Buick 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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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 Buick Code

1. What does OBDII code U179A mean on a Buick?

Code U179A indicates a loss of communication with the Hybrid/EV Powertrain Control Module 2, which is responsible for managing hybrid or electric powertrain functions.

2. What are common symptoms of code U179A on a Buick?

Symptoms may include warning lights on the dashboard, reduced hybrid or EV performance, difficulty starting the vehicle, and limited powertrain functionality.

3. What causes code U179A on a Buick?

Causes can include wiring issues, faulty connections, a malfunctioning Hybrid/EV Powertrain Control Module 2, software glitches, or interference in the communication network.

4. Can I drive my Buick with code U179A active?

While the vehicle may still be drivable, reduced hybrid or EV functionality can affect performance and efficiency. Itâ€™s best to address the issue promptly.

5. How do you diagnose code U179A on a Buick?

Diagnosis involves scanning for trouble codes, inspecting wiring and connectors leading to the Hybrid/EV Powertrain Control Module 2, and checking for network communication errors.

6. Is code U179A specific to hybrid or electric Buicks?

Yes, this code typically appears in hybrid or electric Buick models because it relates to the Hybrid/EV Powertrain Control Module.

7. Can a software update fix code U179A on a Buick?

In some cases, a software update for the affected module or vehicle may resolve communication issues, but hardware problems should also be checked.

8. How much does it cost to repair code U179A on a Buick?

Repair costs vary depending on the cause, ranging from $50-$200 for minor wiring fixes to over $1,000 if the Hybrid/EV Powertrain Control Module needs replacement.

9. What tools are needed to troubleshoot code U179A on a Buick?

A professional-grade OBDII scanner capable of reading manufacturer-specific codes and a multimeter for testing electrical connections are essential.

10. Can a faulty battery cause code U179A on a Buick?

Yes, a weak or malfunctioning hybrid/EV battery can disrupt communication with the Hybrid/EV Powertrain Control Module 2, potentially triggering this code.