Have a very well cared for 08 lacrosse with 64,000 miles,,, a few weeks ago started noticing small shudder/hesitation when making tight turns, yesterday when making a u turn my traction control dash light comes on and my info center says SERVICE TRACTION CONTROL UNIT and SERVICE THEFT DETERANT UNIT. drove it home with then only the info panel saying service the traction control unit and cannot switch the traction control light off....ANY THOUGHTS or suggestions...is this something simple and not to expensive..? is a dealer visit in my future or a regular good mechanic can handle this...thanks in advance.