U0165
Lost Communication with Rear HVAC Control Module
2006-2008 Audi A3 3.2L VR6
Low SeverityNetworkGeneric (SAE)
Description
Cannot communicate with the rear climate control zone module.
Symptoms
- Rear A/C not working
- Rear climate controls unresponsive
- No rear heat
- Rear blower not running
Common Causes
- Rear HVAC module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Rear blower motor issue
Diagnostic Steps
- Check rear HVAC module fuse
- Test power and ground
- Check CAN wiring
- Test rear blower motor
- Inspect rear climate control panel
Repair Notes
Check fuses for rear HVAC system. Rear module wiring runs through pillars.
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
U0165 on Other Vehicles
Common Questions
What does code U0165 mean on a 2006-2008 Audi A3?
U0165 stands for "Lost Communication with Rear HVAC Control Module". Cannot communicate with the rear climate control zone module.
What are the symptoms of U0165 on a Audi A3?
Common symptoms of U0165 include: Rear A/C not working, Rear climate controls unresponsive, No rear heat, Rear blower not running.
What causes U0165 on a 2006-2008 Audi A3?
Common causes of U0165 include: Rear HVAC module failure, CAN bus wiring, Module power loss, Fuse blown, Rear blower motor issue.