2001 Cadillac Seville STS 95k miles Steering Wheel Shakes When I make a Sharp Turn?

On my 01 Cadillac Seville STS the steering wheel starts to shake when I make a sharp left turn. Any ideas what could be causing this?|||check axle,ball joints, brake rotors, and pads.|||Its your ball joints, more than likely.......|||tire rods or u just need a wheel alignment. And if it also shakes when u slow down its a wheel alignment.