2005 Buick Century check engine/anti- lock/ low trac

2005 Buick Century 6 cyl 130000 miles

The check engine light/anti-lock comes on and the low tack light from the right side also comes on. Sometimes its on when I start the car other times it comes on when I am backing out of a parking spot turning the wheel. I have new tires that have been on for 2 months