Traction Control System sensor

In the past week my ADVTRAC on my 03' Expedition has turned itself off twice. The first time I was driving and I heard the "ding" and the message center said "check ADVTRAC". When I arrived at work I shut off the truck, when I left the ADVTRAC was back on. No issues for a week until today when I washed the car. I pulled it out of the car wash and parked it for a while. When I got back in and started it I heard the "ding" again and once again the message center said "check ADVTRAC", but this time the ABS light came on as well. What could be the problem? Will I cause damage to the truck by driving it in this condition?

People keep saying sensor issues but nobody is saying where these sensors are? Leading me to believe they dont know or they will nor say. Another place wantd me to pay $5.00 up front to secure a mecanic then $33.00 to continue to talk with a mechanic. Wow talk about riping the public off eh? All I want to know where these avtrac sensors are so I can replace them. But greed seems to be needed first. Leading me to believe money talks and no money get lost.
Pleade tell me where these avtrac sensors are. Thanks
I read a purple wire behind the drivers side kick panel. Supposed to be 1 wire into a 3 way split coming out of A post? But mine had 2 purple wires 1 had a pink line on it and both are there only wires that does not go into a aplit 3 way wire. So I am lost now. 2 years and still the same thing. This purple wire controls the 4x4 system as well as the heated seats and the lights and stereo don't turn off whenever the doors open. I am not able to find this wire, what color wire is this wire actually? So sevetal issues from the Avtrac system are being affected. So any help will be greatly appreciated.
Thanks