U0166
Lost Communication with Auxiliary HVAC Control Module
2002-2003 BMW X5 4.6is E53 4.6L V8
Low SeverityNetworkGeneric (SAE)
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
- Check auxiliary HVAC fuse
- Test power and ground
- Check CAN wiring
- Test auxiliary heater element
Repair Notes
Check fuses for auxiliary climate system.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0166 on Other Vehicles
Common Questions
What does code U0166 mean on a 2002-2003 BMW X5 4.6is E53?
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 BMW X5 4.6is E53?
Common symptoms of U0166 include: Auxiliary heater not working, Pre-conditioning not available, Remote start climate control disabled.
What causes U0166 on a 2002-2003 BMW X5 4.6is E53?
Common causes of U0166 include: Auxiliary HVAC module failure, CAN bus wiring, Module power loss, Fuse blown.