OBD-II code guide
P0446 EVAP Vent Control Circuit
P0446 means the evaporative emissions vent control circuit or vent operation is not working as expected.
What it means
The EVAP system may not vent or seal properly during fuel vapor leak tests.
Common symptoms
- Check engine light
- Difficulty filling fuel tank
- Fuel smell
- Usually no drivability issue
- EVAP readiness problems
Likely causes
- Vent valve fault
- Blocked vent filter
- Wiring issue
- Charcoal canister problem
- Restricted vapor line
First checks
- Notice if the gas pump clicks off repeatedly.
- Inspect for debris near the vent system if accessible.
- Check for related EVAP codes.
- Do not overfill the tank.