First thing is nice car. Second is that code is generic and indicates a problem with one of the speed sensors, of course it could also mean a problem with the wiring or computer also. If you haven't had any recent repair under the hood the wiring is probably fine but it wouldn't hurt to check. More than likely it is a sensor located in the trans. As you know your car is a rebadged Mercedes. Chrysler may be able to fix the car or sell you the part but........I'm not absolutely certain, I like the Crossfire but I'm not that familiar with them.