P0440 CHEVROLET Evaporative Emission System

Possible causes – Missing or loose fuel cap– Incorrect fuel filler cap used– Fuel filler cap remains open or fails to close– Foreign matter caught in fuel filler cap– EVAP canister or fuel tank leaks– EVAP system hose leaking– Fuel tank leaking– Faulty vent solenoid– Faulty EVAP purge switch Tech description The P0440 code means…