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Home/DTC Codes/Mitsubishi/Eclipse/2000-2012 2.4L I4/U0166
U0166

Lost Communication with Auxiliary HVAC Control Module

2000-2012 Mitsubishi Eclipse 2.4L I4 🇩🇪

Low SeverityNetwork

Description

Cannot communicate with auxiliary heater or auxiliary climate module.

Symptoms

  • Auxiliary heater not working
  • Pre-conditioning not available
  • Remote start climate control disabled

Common Causes

  • Auxiliary HVAC module failure
  • CAN bus wiring
  • Module power loss
  • Fuse blown

Diagnostic Steps

  1. Check auxiliary HVAC fuse
  2. Test power and ground
  3. Check CAN wiring
  4. Test auxiliary heater element

Repair Notes

Check fuses for auxiliary climate system.

Related Codes

U0164Lost Communication with HVAC Control ModuleU0165Lost Communication with Rear HVAC Control Module

Other Network Codes

U0166 on Other Vehicles

Mitsubishi 3000GT

1991-1999 3.0L V6

Mitsubishi 3000GT VR-4

1991-1999 3.0L Twin Turbo V6

Mitsubishi 3000GT VR-4

1991-1999 3.0L V6 Twin Turbo

Mitsubishi Colt JP

2002-2012 1.3L I4 4A90

Mitsubishi Colt JP

2002-2012 1.5L I4 4A91

Mitsubishi Delica D:5

2019-2025 2.2L I4 Turbo Diesel 4N14

Mitsubishi Diamante

1992-1996 3.0L V6

Mitsubishi Diamante

1997-2004 3.5L V6

Common Questions

What does code U0166 mean on a 2000-2012 Mitsubishi Eclipse?

U0166 stands for "Lost Communication with Auxiliary HVAC Control Module". Cannot communicate with auxiliary heater or auxiliary climate module.

What are the symptoms of U0166 on a Mitsubishi Eclipse?

Common symptoms of U0166 include: Auxiliary heater not working, Pre-conditioning not available, Remote start climate control disabled.

What causes U0166 on a 2000-2012 Mitsubishi Eclipse?

Common causes of U0166 include: Auxiliary HVAC module failure, CAN bus wiring, Module power loss, Fuse blown.

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