U0178low severityNetwork
Lost Communication with Rain Sensor Module
on 2013 Subaru Legacy 2.5L H4 · AWD
What this code means
Cannot communicate with the rain-sensing windshield wiper module.
Symptoms
- Auto wipers not working
- Rain sense feature disabled
- Wipers only work in manual mode
Common causes
- Rain sensor failure
- Wiring issue
- Sensor not bonded to windshield
- Fuse blown
- Windshield replacement error
Diagnostic steps
- Check rain sensor power
- Test wiring
- Verify sensor bonded to windshield properly
- Check fuse
- Inspect sensor gel pad
Repair notes
Check sensor mounting gel pad on windshield. Must be rebonded during windshield replacement.
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