OBD codes / P0446
P0446
MinorEVAP Vent Control Circuit Malfunction
Usually safe to drive; fix at your convenience.
Likely causes
- faulty vent valve
- blocked vent
- wiring
Common fixes
- replace vent valve
- inspect charcoal canister
Seeing P0446 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0446 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.