Engine light came on/replaced gas cap. Engine light now back on??? on 2008 Chevrolet Equinox

Please tell me what to do. I have an extended warranty for 100,000 miles, but unsure if this qualifies. Do I take it to dealer at this point?

Asked by for the 2008 Chevrolet Equinox
you need to have codes scanned at auto zone for free then post them so we can advise