P0446 Subaru Forester
EVAP Vent Control Circuit Malfunction · Powertrain Code · Low · Repair: Moderate
What is P0446?
The EVAP vent control circuit has an electrical issue preventing proper vent valve operation.
When the Subaru Forester triggers code P0446 (evap vent control circuit malfunction), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Subaru Forester.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Subaru Forester.
Common Causes on Subaru Forester
- Failed EVAP vent shut valve
- Clogged charcoal canister vent filter
- Damaged wiring to the vent shut valve
- Debris blocking the canister vent outlet
Symptoms
- Check Engine Light on
- Difficulty filling fuel tank
- Possible fuel odor
- No driveability issues
Notes for Subaru Forester
Subaru EVAP vent valves are under the vehicle near the fuel tank; inspect during regular undercar service.