Want does p0440 code mean

P0440 - Evaporative Emission (EVAP) System

This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

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Evaporative emission system malfunction. Could be something as simple as the gas cap wasn't tightened properly, or a hose to the evap canister that has cracked. If you can't see it, you may have to find a shop with a smoke machine. They inject fog into the system and look for leaks. Try the gas cap first, it must be tight and then driven long enough to reset the computer.

http://www.obd-codes.com/p0440