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U179A 2017 Chevrolet Silverado Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Quick Answer

The U179A diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a communication problem between the vehicle's onboard computer system and the Hybrid/EV Powertrain Control Module 2. Common causes include Faulty Wiring: Damaged or corroded wiring connections can disrupt communication between the modules, Loose Connectors: Loose or improperly connected connectors can lead to communication issues, Module Failure: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication problems. 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 2017 Chevrolet Silverado indicates Lost Communication with Hybrid/EV Powertrain Control Module 2.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring connections can disrupt communication between the modules, Loose Connectors: Loose or improperly connected connectors can lead to communication issues, Module Failure: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication problems.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code U179A 2017 Chevrolet Silverado Description

The U179A diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a communication problem between the vehicle's onboard computer system and the Hybrid/EV Powertrain Control Module 2. This module is responsible for managing the hybrid or electric powertrain components in the vehicle. When communication is lost with this module, it can lead to a variety of issues affecting the performance and efficiency of the vehicle.

OBDII Code U179A 2017 Chevrolet Silverado - Lost Communication with Hybrid/EV Powertrain Control Module 2
U179A 2017 Chevrolet Silverado Code - Lost Communication with Hybrid/EV Powertrain Control Module 2

Common Causes of U179A 2017 Chevrolet Silverado

  1. Faulty Wiring: Damaged or corroded wiring connections can disrupt communication between the modules.
  2. Loose Connectors: Loose or improperly connected connectors can lead to communication issues.
  3. Module Failure: A malfunctioning Hybrid/EV Powertrain Control Module 2 can cause communication problems.
  4. Software Glitch: An issue with the vehicle's software or programming can also trigger this code.

Symptoms of U179A 2017 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Power: The vehicle may experience a loss of power, especially when utilizing the hybrid or electric components.
  3. Poor Fuel Efficiency: Due to the communication issue, the vehicle may exhibit decreased fuel efficiency.
  4. Erratic Behavior: The vehicle may exhibit erratic behavior, such as rough idling or difficulty shifting gears.

How to Fix U179A 2017 Chevrolet Silverado

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the wiring, connectors, and modules.
  2. Repair Wiring/Connectors: Repair or replace any damaged wiring or connectors that may be causing the communication problem.
  3. Replace Module: If the Hybrid/EV Powertrain Control Module 2 is determined to be faulty, it will need to be replaced.
  4. Clear Codes: After completing the repairs, clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U179A 2017 Chevrolet Silverado

The typical repair costs for addressing a U179A code on a 2017 Chevrolet Silverado can range from $200 to $600, depending on the exact cause of the communication failure and the cost of parts and labor. It's important to note that diagnosis time and labor rates can vary, so it's advisable to check with local auto repair shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 2017 Chevrolet Silverado Code

1. What does the OBDII code U179A mean on a 2017 Chevrolet Silverado?

The U179A code indicates "Lost Communication with Hybrid/EV Powertrain Control Module 2," meaning the vehicle's primary computer cannot communicate with the secondary hybrid or EV control module.

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

Symptoms include the check engine light or service warning lights, reduced fuel efficiency, poor hybrid system performance, or the vehicle entering limp mode.

3. What causes the U179A code on a 2017 Chevrolet Silverado?

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

4. Can I still drive my 2017 Chevrolet Silverado with the U179A code?

Driving may be possible, but the vehicle could experience reduced performance or enter limp mode. It’s best to address the issue as soon as possible to avoid further damage.

5. How is the U179A code diagnosed?

A mechanic will use a diagnostic scanner to access the code, inspect wiring and connectors for damage, check the CAN bus network, and test the Hybrid/EV Powertrain Control Module 2 for faults.

6. How do I fix the U179A code on my 2017 Chevrolet Silverado?

Fixes may include repairing or replacing damaged wiring or connectors, reprogramming or replacing the Hybrid/EV Powertrain Control Module 2, or updating the vehicle’s software.

7. Is the U179A code specific to hybrid or EV systems?

Yes, this code is specific to vehicles with hybrid or electric systems and relates to communication between powertrain control modules.

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

Repair costs vary but may range from $100 for wiring repairs to over $1,000 if the control module needs replacement and reprogramming.

9. Can a software update fix the U179A code?

Sometimes, a software update may resolve communication issues if the problem is caused by a programming glitch in the vehicle’s modules.

10. What should I check first if I get the U179A code?

Start by inspecting the wiring and connectors related to the Hybrid/EV Powertrain Control Module 2 for damage, corrosion, or loose connections.

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