P0446: Evaporative Emission Control System Vent Control Circuit
Severity: low
What it means: There's a problem with the EVAP vent valve or its circuit. The valve that seals the system for leak testing isn't working right.
Safe to drive? Yes, generally safe to drive.
Common symptoms
- Check-engine light
- Possible trouble refueling (the pump keeps clicking off)
Likely causes, ranked
- Failed or stuck vent valve/solenoidShop
- Wiring or connector faultShop
- Blocked vent filter or canisterShop
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What it means: There's a problem with the EVAP vent valve or its circuit. The valve that seals the system for leak testing isn't working right.
Severity: Low. Safe to drive? Yes, generally safe to drive.
DIY or shop?
Inspect the wiring and the vent valve. The vent valve is often near the fuel tank.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Generally not urgent, but a code only points to a system, not always a specific part. Verify with a mechanic before buying expensive parts.
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