P0446
ModerateP0446 — Evaporative Emission Canister Vent Valve Control Circuit
Description
What P0446 Means
Code P0446 points to a fault in the evaporative emission (EVAP) canister vent valve control circuit. The fuel vapor capture system keeps gasoline vapors from escaping into the atmosphere. The DME-controlled canister vent valve opens to purge the canister with fresh air and route the vapors into the intake manifold for combustion.
The code sets when the DME detects an out-of-range signal in the valve control circuit — an open, a short, or a faulty valve itself.
Symptoms
Symptoms
- Check Engine light is on.
- A fuel smell is possible, especially after refueling or while parked.
Causes and fixes
Diagnosis and Repair
- Read the fault codes with diagnostic equipment (ISTA, INPA).
- Check the EVAP canister vent valve: coil integrity, no sticking, resistance.
- Check the wiring and connectors in the valve control circuit: open, short, corroded contacts.
- Replace the faulty components: vent valve, damaged wiring sections, or connectors.