DTC P0447: EVAP System Vent Control - Vent Control Circuit Open: Condition

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.

DTC sets when EVAP Canister Vent Valve (EVAP-CVV) output voltage is low while ECM commands EVAP-CVV to open. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

EVAP-CVV malfunction.
EVAP-CVV circuit malfunction.
ECM malfunction.