I totally agree with smj999smj.
I recently experienced a problem with my slip light. The VDC reset would always work. HOWEVER, I had idling issues, stalling issues, and the VDC would come on at the same time. Through searching this forum, I found a gamut of results from ABS system to ECM to a switch in the brake pedal malfunctioning, to vacuum issues, etc.
Mine ended up being a coolant temp sensor that went bad. It was only occurring during below 0 temps (I'm in the Northeast). Got it fixed and had no more issues.
THEN, my wife took the pathy for a day and the dash blew up on her. She said the 4wd indicator would flash, ABS warning lights went on, VDC, Slip. Ended up, we had the front driver side wheel bearing go bad. Still, that was the first time we experienced a bearing go bad in that way.
I know this probably isn't all that helpful, but definitely try checking your bearings first. After that, start paying extremely close attention to your pathy, environmental conditions, who's driving, their style, anything you can think of, because (as far as for me) it's like that part of the warning system covers an awful lot.