Fuel cap warning message stays on (MIL works OK, no DTCs set) (Except Touring)

Diagnostic procedure

Do the troubleshooting procedure for DTC P0455 and P0456 , if the fuel cap warning message comes on frequently, or if the message does not go off after the fuel fill cap is tightened and the vehicle is driven several days.

NOTE:  Fuel cap warning message is monitored during the engine off natural vacuum (EONV) testing.