The vent control valve circuit in the EVAP system has malfunctioned. The vent valve allows air into the charcoal canister during purging and seals the system during leak tests.
Find certified mechanics near you who can diagnose and repair P0446.
For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.