U0184low severityNetwork
Lost Communication with Radio Module
on 2021 Mazda Mazda3 2.5L I4 · FWD
What this code means
Cannot communicate with the radio or entertainment system head unit.
Symptoms
- Radio display blank
- No audio
- Infotainment system offline
- Touchscreen not responding
- Backup camera display not available
Common causes
- Radio module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Software crash
Diagnostic steps
- Check radio fuse
- Test power and ground
- Check CAN wiring
- Try radio reset procedure
- Check for software update availability
Repair notes
Check fuses. Many head units can be reset by pulling the fuse for 30 seconds.
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