AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Chevrolet - U0166 Chevrolet

U0166 Chevrolet Code - Lost Communication With Auxiliary Heater Control Module

- Code Popularity: 1,192 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC U0166 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Auxiliary Heater Control Module
  • Auxiliary Heater Control Module harness is open or shorted
  • Auxiliary Heater Control Module circuit poor electrical connection
⚠ Does your Chevrolet have Safety Recalls? → Check here

How to Fix the DTC U0166 Chevrolet?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for U0166 Chevrolet Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0166 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code U0166 Chevrolet Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Auxiliary Heater Control Module has not been received.

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

Need More Information on the Code?

Need more information on how to fix the U0166 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0166 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Code U0166 Chevrolet comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U0166 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks