Service engine light on on 2007 Suzuki Grand Vitara

My service engine light came on when I started my car this morning and now my cruise control won't work. I took the car to AutoZone and the read out said it was an "Emmisions system" problem. What could be causing this and is it expensive to repair?

1 answer
The readout should have returned a diagnostic trouble code, that code will allow someone to be able to answer your question. Do you have the codes?