U0164low severityNetwork
Lost Communication with HVAC Control Module
on 2019 Mazda Mazda3 2.5L I4 · FWD
What this code means
Cannot communicate with the climate control module.
Symptoms
- Climate control not working
- No A/C
- Fan not responding
Common causes
- HVAC module failure
- Fuse
- CAN bus
- Wiring
Diagnostic steps
- Check fuses
- Test power
- Check CAN wiring
Repair notes
Check fuses and power supply.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus