There are choices. First one is it's a glitch, and what you need to do is just to reset the computer (it happens sometimes especially if it's humid around). Second one is a malfunctioning sensor. Most of the time the sensor located on the charcoal canister fails (~$200 with labor; price depends on state).
Evaporative Emission Control System Malfunction
Trouble code P0440 means: Evaporative Emission System
Trouble code P0440 means: Evaporative Emission System
Trouble code P0440 means: Evaporative emission control system malfunction
This ODB code could indicate a problem with any part of the evaporative emission control system: gas cap, rubber hoses, canister, or purge solenoid.
Trouble code P0440 means: Evaporative Emission (EVAP) System - Continuous Purge Flow
http://www.obd-codes.com/p0440
Generic codes P0440 Evaporative emission system malfunction P0401 Exhaust gas recirculation system Insufficient flow detected.
yes. It is only the fuel evaporative system detecting a leak or fault.
Usually related to the evaporative system leak in your vehicle. Possibly just a loose or defective gas cap but might involve a leak or valve problem in the evap system.
P0171 is system too lean, P1476 and P0440 are related to an evaporative system leak, and P1582 is idle adaptation at limit. You either have a leak in a vacuum hose or evaporative hose or a bad leak detection pump.
No- Code P0440 is only an evaporative emissions failure and will not cause your car to use more gasoline. On the other hand having this code stored in your system will result in an emissions test failure.