ABS and Traction Lights came on in 2004 Buick Lesabre?

Today my ABS and Traction Off lights came on randomly in my 2004 Buick Lesabre. Neither have ever come on before. I got the rotors, brake pads, and one wheel hub replaced a little over two months ago, took the car back about three weeks ago because the brakes were squealing something awful, but working fine. Now, this happened.

The weird thing is, if I turn the car on, the lights stay off. If I'm in reverse, the lights stay off. It's only when I shift into drive that the lights come on. However. my braking has been just fine otherwise.

What in the world is going on here?
 
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