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The P0440 was the only code present? No other codes set along with it?
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The P0440 is set when there is a leak in the EVAP System or the Vapor Pressure Sensor has failed. So, first and foremost, check the fuel cap. Make sure the cap is tight and sealing correctly. Check the underside of the fuel cap for any cracks or signs of defects that may keep the cap from sealing correctly. If there are any doubts about the inspection of the cap, replace it. Keep in mind, you will need a cap that meets OE Specs. Those "universal" or "locking" fuel caps sold at after market parts stores do not meet OE specs, and will not seal the system correctly.
If you are certain the cap is good, then next step should be to have the EVAP System "smoked". This is where a machine forces smoke through the system and any leaks can be more easily found and repaired.
If the smoke test proves no leaks, then the problem lies in the vapor pressure sensor. It's located at the top of the fuel tank, mounted to the top of the fuel pump assembly. Inspect the electrical connector and wire harness for any loose, broken or damaged wires before replacing the sensor.
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Hi! I noticed this Q&A was still open uld do for you on this issue? Any other questions you had? Any other info I can provide that may better assist?