well i had that issue today. and it came on i checked my gas cap it was bit loose. turned it tight and drove for about 5 minutes and it went off. if u've ever ownd a high maintence car likea bmw or something. that happends to all those things. i got a 04 colorado the other day my self with 60k on it and the gas cap has to be replaced soon its a bit loose when its tight. so that also my be and issue.