A code P0440 could mean one or more of the following has happened:
•The gas cap is not installed or working properly
•The purge solenoid has failed
•The canister is plugged and not working properly
Possible Solutions
With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
•Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
•Inspect the EVAP system for cuts/holes in tubes/hoses
•Inspect for damaged or disconnected hoses around the Evap purge solenoid
•Check and/or replace the sensor
•Check and/or replace the purge valve
•Have a professional use a smoke machine to detect leaks
Jul 10, 2010 at 11:28 PM
