P0447 — EVAP System Vent Control Circuit Open

P0447: The evaporative-emissions system vent-control circuit is open.

Meaning, symptoms, causes and checks

The evaporative-emissions system vent-control circuit is open. The definition concerns electrical control of venting, rather than the amount of purge flow.

Affected system: Powertrain

Symptoms

  • Engine warning lamp; fuel smell.

Possible causes

  • Faulty vent valve, damaged wires or loose connectors.

What to check

  • Inspect vent-valve wiring and connectors; check EVAP fuses.

Also written as: P0447-00, P044700, PO447 (some scan tools add the fault-type byte, e.g. -00).