U0301high severityNetwork
Software Incompatibility with ECM/PCM
on 2011 Subaru Legacy 3.6L H6 · AWD
What this code means
The data protocol or software version from the ECM/PCM is incompatible with other vehicle modules.
Symptoms
- Check Engine Light
- Transmission shift issues
- Other modules reporting ECM data errors
- Systems not responding to ECM commands
Common causes
- ECM software version mismatch
- ECM reprogramming incomplete
- Wrong ECM software loaded
- ECM hardware revision mismatch
Diagnostic steps
- Check ECM software version
- Compare to required version
- Reprogram ECM with correct software
- Check for TSBs
- Verify ECM hardware part number matches software
Repair notes
Reprogram ECM/PCM with correct calibration. Verify correct part number and software version.
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