P0446 fault code: what it means
P0446: EVAP vent valve control circuit or vent system fault.
Usual causes, most likely first
- failed EVAP vent valve
- blocked vent hose or filter
- wiring or connector fault at the vent valve
Not sure what P0446 means on your car? Ask Credov.
Before you clear it
Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.
Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.