So my '00 decided to display the ol' "Check Advancetrac" message the other day. I hit the reset button and the message went away, but the light on the dash remained on. It comes and goes now; sometimes it clears when I shut the car off and restart it; other times it doesn't... but it's not a constant thing.
Then, I was parking the car in the lot next to my post office and I happened to brake on a small patch of ice. The front wheels locked up. I thought, "Hmmm, that's not supposed to happen." So my guess is, that I have an ABS sensor going bad; hence screwing up the Advancetrac. Sound about right?