How to fix the gas cap warning message on jeep patriot code P0457

[@FelixHernandez-l4w]

What happens if you don't fix it

[@stevedelgado3336]

love the music! : )

[@Seraphim6knows]

I just fixed that problem … messages still on there

[@acmecompany]

Wrong diagnosis

[@lenseguy8103]

Hah I had to replace the evaporator system purge valve. Would have kept driving this way if not for the fact it would not pass ca smog test