AutoCodes – Cadillac – U179A Cadillac

U179A Cadillac 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 Cadillac 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 527

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

What does this mean?

What are the Possible Causes of the DTC U179A Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code U179A (Lost Communication with Hybrid/EV Powertrain Control Module 2) in a Cadillac?

- Common symptoms include loss of power or acceleration, poor fuel efficiency, warning lights illuminated on the dashboard, and difficulty starting the vehicle.

2. What are possible causes of OBDII code U179A in a Cadillac?

- Possible causes include a malfunctioning Hybrid/EV Powertrain Control Module 2, wiring or connection issues, a faulty communication network, or software glitches.

3. How can I diagnose OBDII code U179A in my Cadillac?

- Diagnosing this code typically involves using an OBDII scanner to read the specific error code, checking the connections to the Hybrid/EV Powertrain Control Module 2, inspecting wiring for damage, and performing a communication network test.

4. Can I still drive my Cadillac with OBDII code U179A present?

- It is not recommended to continue driving the vehicle with this code present, as it can indicate potential issues with the hybrid powertrain system that may affect the safety and performance of the vehicle.

5. How can I clear OBDII code U179A in my Cadillac?

- Clearing the code involves using an OBDII scanner to reset the error codes after addressing the underlying issue. If the problem persists, the code may reappear, indicating an ongoing problem.

6. Is it safe to attempt repairs for OBDII code U179A on my own?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing issues related to the hybrid powertrain system in a Cadillac may require specialized knowledge and tools. It is advisable to consult with a professional mechanic.

7. Will OBDII code U179A cause permanent damage to my Cadillac if not addressed promptly?

- Ignoring this code can potentially lead to further damage to the hybrid powertrain system and other components of the vehicle. It is best to address the issue promptly to prevent costly repairs down the line.

8. Are there any common repair tips for resolving OBDII code U179A in a Cadillac?

- Common repair tips include checking and securing wiring connections, ensuring proper communication network functionality, updating software if needed, and conducting a thorough inspection of the Hybrid/EV Powertrain Control Module 2.

9. How much can I expect to pay for repairs related to OBDII code U179A in a Cadillac?

- Repair costs can vary depending on the specific issue causing the code and the labor rates in your area. It is recommended to obtain quotes from reputable mechanics or dealerships to get an accurate estimate.

10. Can extreme weather conditions affect the occurrence of OBDII code U179A in a Cadillac?

- Extreme weather conditions, such as extreme heat or cold, can potentially impact the performance of the hybrid powertrain system and lead to communication errors that trigger the U179A code.