A vent valve stuck open or closed (dirt, spider webs or water get in). A failed vent valve solenoid. Damaged wiring or a corroded connector. A clogged vent filter or hose.

Trouble codes › P0446

P0446 Evaporative Emission System Vent Control Circuit

Q: What does P0446 mean?

P0446 means the EVAP vent valve isn't working properly, often stuck from dirt or water. The engine computer found a problem with the EVAP vent valve, which opens and closes the system to the air (usually near the charcoal canister by the fuel tank).

EVAP

P0446 means the EVAP vent valve isn't working properly, often stuck from dirt or water.

The engine computer found a problem with the EVAP vent valve, which opens and closes the system to the air (usually near the charcoal canister by the fuel tank).

Can I keep driving? Yes, for now.

Safe to drive. On some vehicles it can make the fuel pump nozzle click off early when filling up.

Common causes

A vent valve stuck open or closed (dirt, spider webs or water get in)
A failed vent valve solenoid
Damaged wiring or a corroded connector
A clogged vent filter or hose

Symptoms

Check-engine light
Trouble filling the tank on some vehicles
Fuel smell

What to check first

Find the vent valve (usually near the canister) and check its connector and wiring.
Check the vent hose and filter for blockage.
Command the vent valve with a scan tool and listen for clicking.
Replace the valve if it's stuck.

What does P0446 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about P0446

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Related codes

General guidance for P0446 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.