U0161low severityNetwork
Lost Communication with Convenience Module A
on 2020 Mazda Mazda3 2.0L I4 · AWD
What this code means
Cannot communicate with the convenience electronics module managing keyless entry, approach lighting, etc.
Symptoms
- Keyless entry not working
- Welcome lights not activating
- Convenience features disabled
- Auto-fold mirrors not working
Common causes
- Convenience module failure
- CAN bus wiring
- Module power loss
- Fuse blown
Diagnostic steps
- Check convenience module fuse
- Test power and ground
- Check CAN wiring
- Test individual convenience features
- Inspect module connector
Repair notes
Check fuses and BCM integration. Convenience features often managed through BCM sub-module.
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