Unraveling the P0446 on Your 2022 Subaru Impreza
A P0446 code on your 2022 Subaru Impreza means the ECM has detected an electrical malfunction in the EVAP vent control circuit. The fifth-generation Impreza with the 2.0L FB20 boxer engine uses a canister vent control valve for evaporative emissions management. This is a circuit-level fault, not a vapor leak.
At three to four years old, the 2022 Impreza may still have warranty coverage, making this a potentially no-cost fix.
Symptoms on the Scene
- Check engine light on with P0446
- Fuel nozzle clicking off during fill-ups
- EVAP monitor not completing
- May appear with companion codes
Ranked Suspects
- Canister Vent Control Valve Malfunction (High Likelihood): The vent valve near the charcoal canister is the primary P0446 suspect. Parts $45–$90, labor $80–$180.
- Vent Valve Connector Corrosion (High Likelihood): Road moisture and salt corrode the connector terminals. Repair costs $55–$135.
- Purge Control Solenoid Cross-Fault (Medium Likelihood): The boxer engine's purge solenoid can affect EVAP system behavior. Replacement costs $70–$185.
- Wiring Damage (Medium Likelihood): Road debris can damage vent valve wiring. Repair costs $75–$250.
- Gas Cap Seal Wear (Low Likelihood): Quick, inexpensive first check. New cap $15–$30.
Diagnostic Steps
- Try a new gas cap first
- Confirm P0446 with an OBD-II scanner
- Inspect the vent valve connector for corrosion
- Test vent valve resistance
- Apply 12V to verify operation
- Check wiring from the valve to the ECM
Cost Breakdown
- Vent valve: $125–$270
- Connector repair: $55–$135
- Purge solenoid: $70–$185
- Wiring repair: $75–$250
- Diagnostic fee: $75–$130
Can I Drive With P0446?
Yes. P0446 doesn't affect your Impreza's engine, CVT, or Symmetrical AWD. Emissions-only code.
Warranty Status
Your 2022 Impreza may still be within Subaru's 3-year/36,000-mile basic warranty. The federal emissions warranty provides 8 years/80,000 miles of EVAP coverage. Check your mileage and visit the dealer first.