The MIL illuminates with DTC P2422 (EVAP canister vent shut valve close malfunction) on 2008-2009 Honda Accord models.
The probable cause: Spider webs are clogging the EVAP canister vent hose or the drain box.
Clean the spider webs out of the EVAP canister vent hose or drain box, and install a spring in the drain box (fuel drain spring P/N 17743-TA0-999, H/C 9139783).
Raise the vehicle on a lift. Locate the mounting bolt for the EVAP drain box above the driver’s side rear subframe and remove the bolt.
Pull down the drain box. Disconnect the fuel tank pressure (FTP) sensor vent hose from the drain box and disconnect the EVAP vent hose from the EVAP canister.
Remove the EVAP vent hose from the drain box. Remove the drain box cover by prying open the retaining tabs with a small screwdriver.
Inspect the EVAP vent hose and the drain box. Clean out any spinder webs from the drain box and the EVAP vent hose with compressed air or a small cleaning brush.
Install the fuel drain spring over the EVAP vent hose port in the drain box and reinstall the drain box cover. Note: If any of the drain box cover retaining tabs are broken, replace the drain box.
Reinstall the drain box and the EVAP vent hose. Use the HDS to clear the DTC, then run the EVAP system function test.