U0064high severityNetwork
Lost Communication with Diagnostic Gateway Module
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
Cannot communicate with the diagnostic gateway that routes scan tool communication to vehicle buses.
Symptoms
- Scan tool cannot connect
- OBD port no communication
- Cannot read any DTCs
- Cannot perform diagnostics
Common causes
- Gateway module power failure
- Gateway module failure
- CAN bus issue to gateway
- OBD port wiring damage
- Fuse blown
Diagnostic steps
- Check gateway module fuse
- Test power and ground at gateway
- Check OBD port pin connections
- Test CAN wiring from OBD port to gateway
- Verify gateway module operation
Repair notes
Check OBD port wiring and gateway module power supply. Common on VW/Audi vehicles.
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