This means that there is a leak in the vehicles EVAP system. Basically pressure is getting out. Most times this is caused by a fuel cap gasket being cracked over time or you forgot to put the cap back on after filling up the tank. Replacement gas cap is $9.99 at Autozone or O'Reilly.
Leak in evap system
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
evap system
Trouble code P0171 means: Fuel Trim System Lean (Bank 1 Trouble code P0440 means: EVAP System No Flow During Purge
Trouble code P0440 means: Evaporative Emission System
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