P1443low severityPowertrain
EVAP Vent Control Function Problem
on 2021 Subaru Impreza 2.0L H4 · AWD
What this code means
The PCM has detected a functional problem with the EVAP canister vent control. The vent valve is not performing its intended function during the EVAP system leak check, preventing the system from sealing for the pressure test.
Symptoms
- Check Engine Light
- Failed emissions test
- EVAP monitor will not complete
- Possible fuel odor
Common causes
- Faulty canister vent control valve (stuck open)
- Vent valve wiring issue
- Blocked or damaged vent line
- Charcoal canister blockage
- Vent filter clogged with debris
Diagnostic steps
- Command vent valve closed with scan tool and check if system holds vacuum
- Test vent valve solenoid resistance
- Inspect vent line for blockage
- Check vent filter for debris
- Smoke test EVAP system
Repair notes
Replace the canister vent valve if it does not seal when commanded closed.
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