my 2009 dts will not start

I'm assuming u meant doesn't crank. When u say doesn't start, car turns over but doesn't run. If it doesn't turn over, make sure battery is fully charge. If battery is good, check battery cables for corrosion including the one to the starter. If cables are ok, check for voltage at starter solenoid, if no voltage, trace back to starter relay, if relay is not being energized, trace voltage back to ignition switch

Car turns over pull key back car still turning over but doesn't start

My st a was put in park. Then it would not change gears. It then shut off and will not start now nor does it change gears. It does not crank. The battery is good and lights and radio come on but no start up