U0204low severityNetwork
Lost Communication with Mirror Control Module
on 2016 Mazda Mazda3 2.0L I4 · FWD
What this code means
Cannot communicate with the power mirror or auto-dimming mirror control module.
Symptoms
- Mirror adjustment not working
- Auto-dimming not functioning
- Mirror memory not working
- Auto-fold mirrors disabled
Common causes
- Mirror module failure
- Wiring issue
- Module power loss
- Fuse blown
- Mirror motor failure
Diagnostic steps
- Check mirror module fuse
- Test power and ground
- Inspect door jamb wiring
- Test mirror motors
- Check mirror switch
Repair notes
Check door jamb wiring. Mirror wiring passes through flex point and commonly breaks.
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