Diagnostic Trouble Code
P0446 — EVAP Emission Control System Vent Control Circuit
EVAP Emission Control System Vent Control Circuit
Definition
The EVAP vent control circuit has malfunctioned. The vent valve controls airflow into the charcoal canister and is essential for the system's leak detection self-test.
Common Causes
- Faulty vent solenoid valve
- Blocked vent filter or line (insects, debris)
- Wiring or connector issue
- Charcoal canister restriction