I JUST got the diagnostic back on my car and it had the same code, P0440, come up. It means there was an evaporation leak detected. It can mean a few things could be leaking on your vehicle, down to as simple as tightening your gas cap.
http://repairpal.com/OBD-Code-P0440
Hope this helps!
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means: EVAP System No Flow During Purge
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means: EVAP System No Flow During Purge
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction