Chevrolet Repair: traction control system warning, brake warning light, speed sensors

Question
My ABS light also comes on and the traction control is turned off when the car is started
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The text above is a follow-up to ...

-----Question-----
My service traction system light came on after my brakes were replaced on my 2003 Impala. It also feels like the brakes are grinding and are very grabby especially after a rain or I take it thru a carwash.Any Ideas?
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any other lights come on? if not, two things, check your e-brake. if thats even on one click, itll turn that light on, along with your rbwl, (red brake warning light). if thats not it, you will have to have the system scanned for trouble codes. there are too many things that can set that light. try checking your speed sensors also.

Answer
check the speed sensors. sounds like one might have gotten damaged. still, if you get it scanned it will tell you which one is bad. maybe not bad, check the connectors. one might have just been disconnected and never reconnected. if they are both connected, have the vehicle scanned.