it means you have to get the CEL code read to find out what it means.
no one here can tell you what's wrong with the car, if anything, by your description.
you can go to autozone and they should do it for free so you don't have to go to the dealer. get it read and come back with whatever they tell you what code was thrown.
how's the car driving otherwise? and fyi, on SH's, whenever the check engine light goes on, the ATTS light will go on too. so don't assume something's wrong with the ATTS.