P3625moderate severityPowertrain
Dynamic Skip Fire (DSF) Control Module Communication Error
on 2015-2019 Subaru Legacy 2.5L H4 · AWD
What this code means
The Dynamic Skip Fire control module that selectively fires individual cylinders based on demand has a communication fault with the PCM.
Symptoms
- Check Engine Light
- DSF system disabled
- Constant all-cylinder firing
- Reduced fuel economy
- Engine may vibrate more than usual
- No smooth cylinder deactivation transitions
Common causes
- CAN bus communication fault
- DSF module failure
- PCM DSF driver circuit issue
- Wiring harness damage
- Software version mismatch
Diagnostic steps
- Check communication between DSF module and PCM
- Read DSF module fault codes
- Inspect CAN bus wiring to DSF module
- Verify software versions match
- Test DSF module power supply
Repair notes
Repair CAN bus wiring. Replace DSF module if internal fault. Update software if version mismatch detected.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1