Tracking the P0446 on Your 2022 Subaru WRX
A P0446 code on your 2022 Subaru WRX reveals an EVAP vent control circuit malfunction. The all-new WRX (VB platform) brought a complete redesign powered by the 2.4L FA24 turbocharged boxer engine — a significant upgrade from the previous EJ25 turbo. The ECM has detected that the canister vent control valve's circuit has an electrical fault.
The WRX's performance-oriented driving style generates more heat and fuel vapors than a typical commuter car, but the EVAP circuit diagnosis follows the same electrical fundamentals. At three to four years old, warranty coverage is likely still available.
Symptoms You've Noticed
- Check engine light on with P0446 stored
- Fuel nozzle clicking off prematurely
- EVAP readiness monitor not completing
- May appear with P0441 or P0456
Ranked Causes
- Canister Vent Control Valve Malfunction (High Likelihood): The vent valve near the charcoal canister is the primary P0446 suspect. The turbo WRX's higher underhood temperatures can stress electrical components. Parts $50–$100, labor $85–$195.
- Vent Valve Connector Corrosion (High Likelihood): Road moisture and performance driving conditions can accelerate connector wear. Repair costs $60–$150.
- Purge Control Solenoid Issue (Medium Likelihood): The FA24 turbo's purge solenoid faces higher heat loads. A failing purge valve affects overall EVAP behavior. Replacement costs $80–$210.
- Wiring Harness Damage (Medium Likelihood): Performance driving, speed bumps, and road conditions can stress underbody wiring. Repair costs $85–$270.
- Gas Cap Seal Wear (Low Likelihood): Quick first check. New cap $15–$30.
Diagnostic Steps
- Try a new gas cap — cheap elimination
- Scan for all codes and freeze frame data
- Inspect the vent valve connector for corrosion
- Test vent valve resistance against Subaru specs
- Apply 12V to verify operation
- Check wiring from the valve to the ECM
Cost Breakdown
- Vent control valve: $135–$295
- Connector repair: $60–$150
- Purge solenoid: $80–$210
- Wiring repair: $85–$270
- Diagnostic fee: $80–$140
Can I Drive With P0446?
Yes. P0446 doesn't affect your WRX's 271-hp turbo boxer, 6-speed manual (or CVT), or Symmetrical AWD performance. Full power is available.
Warranty Status
Your 2022 WRX may still be within Subaru's 3-year/36,000-mile basic warranty. The federal emissions warranty covers EVAP for 8 years/80,000 miles. Check your mileage and visit the dealer first.