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U0166 Chevrolet Code - Lost Communication With Auxiliary Heater Control Module

Quick Answer

The U0166 code for Chevrolet vehicles indicates that there has been a communication failure with the Auxiliary Heater Control Module. Common causes include Faulty wiring or connections to the Auxiliary Heater Control Module, Malfunctioning Auxiliary Heater Control Module, Communication network issues within the vehicle. 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
U0166 Chevrolet indicates Lost Communication With Auxiliary Heater Control Module.
Common causes
Common causes include Faulty wiring or connections to the Auxiliary Heater Control Module, Malfunctioning Auxiliary Heater Control Module, Communication network issues within the vehicle.
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 10, 2024
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Code U0166 Chevrolet Description

The U0166 code for Chevrolet vehicles indicates that there has been a communication failure with the Auxiliary Heater Control Module. This module is responsible for controlling the operation of the auxiliary heater, which is used to provide additional heating to the vehicle's interior. When communication is lost with this module, it can result in the auxiliary heater not functioning properly or at all.

OBDII Code U0166 Chevrolet - Lost Communication With Auxiliary Heater Control Module
U0166 Chevrolet Code - Lost Communication With Auxiliary Heater Control Module

Common Causes of U0166 Chevrolet

  1. Faulty wiring or connections to the Auxiliary Heater Control Module
  2. Malfunctioning Auxiliary Heater Control Module
  3. Communication network issues within the vehicle
  4. Electrical system failures
  5. Water damage or corrosion to the control module

Symptoms of U0166 Chevrolet

  1. Lack of heat in the cabin
  2. Inconsistent or weak heat output
  3. Inability to defrost windows effectively
  4. Illumination of the check engine light
  5. Difficulty controlling the climate settings

How to Fix U0166 Chevrolet

  1. Perform a diagnostic scan to confirm the U0166 code and identify the specific issue.
  2. Inspect the wiring and connections to the Auxiliary Heater Control Module for any damage or corrosion.
  3. Test the control module for proper functionality and replace if necessary.
  4. Clear the code from the vehicle's computer system and perform a test to ensure proper communication with the module.
  5. Reset the system and test the auxiliary heater to verify that it is functioning correctly.

Cost to Fix U0166 Chevrolet

The typical repair costs for addressing the U0166 code can vary depending on the specific cause of the issue. Generally, the cost of parts for replacing a faulty control module can range from $200 to $500, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may fall within the range of $300 to $700. However, it is advisable to check with local auto repair shops for more accurate estimates, as rates can vary based on location and other factors.

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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 U0166 Chevrolet Code

1. What are the common symptoms of OBDII code U0166 in a Chevrolet related to lost communication with the auxiliary heater control module?

- Common symptoms may include the auxiliary heater not functioning properly, a check engine light illuminated on the dashboard, and potential issues with the vehicle's heating system.

2. What are some possible causes of OBDII code U0166 in a Chevrolet?

- The code U0166 can be triggered by issues such as a faulty auxiliary heater control module, damaged wiring or connectors, a blown fuse, or a communication network problem within the vehicle.

3. How can I diagnose the issue causing OBDII code U0166 in my Chevrolet?

- Proper diagnosis involves using a scan tool to retrieve the specific fault codes present in the vehicle's system, checking the wiring and connectors for any visible damage, and testing the auxiliary heater control module for functionality.

4. Is it safe to continue driving my Chevrolet with OBDII code U0166 present?

- It is generally not recommended to continue driving the vehicle with the code U0166 present, as it can lead to further issues with the auxiliary heater system and potentially affect the overall performance of the vehicle.

5. Can I repair OBDII code U0166 in my Chevrolet by myself, or do I need professional assistance?

- While some basic troubleshooting steps can be taken by DIY enthusiasts, resolving the underlying cause of the code U0166 may require specialized knowledge and tools, making professional assistance advisable in many cases.

6. Are there any quick repair tips for addressing OBDII code U0166 in a Chevrolet?

- Quick repair tips may include checking and replacing any blown fuses related to the auxiliary heater system, inspecting the wiring for damage, and ensuring all connectors are properly connected and secure.

7. How much can I expect to pay to fix OBDII code U0166 in my Chevrolet at a repair shop?

- The cost of fixing OBDII code U0166 can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, considering parts and labor costs.

8. Will resetting the OBDII code U0166 in my Chevrolet make the problem go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code U0166 is not addressed, the problem is likely to reoccur.

9. Can extreme weather conditions impact the likelihood of encountering OBDII code U0166 in a Chevrolet?

- Extreme cold or hot weather conditions can potentially put additional strain on the auxiliary heater system, increasing the chances of issues related to code U0166 occurring.

10. How long does it typically take to repair OBDII code U0166 in a Chevrolet?

- The repair time for OBDII code U0166 can vary depending on the specific cause of the problem and the availability of parts, but it may take anywhere from a few hours to a full day to complete the repairs.

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