洗车后问:“转向失败”光了。

两次我已经自动洗车,在离开的时候,我有转向,但dash说“安全动力转向失败,靠边。”The first time I took it to the Volvo dealership and of course they told me a gasket needed to be replaced to the tune of $400. They also said I needed new tires and brakes, but I didn't. But why is this light coming on? Obviously I will not take it to an automatic carwash again, but what the heck is wrong with it?

我的车有68000英里。
我的车有一个自动变速器。