I've got a 2001 Pontiac Grand Prix. Occasionally when I'm driving the front end out my car makes a dull, almost-grinding noise. It's not super loud, but I can feel it vibrate a little through the floorboard. The "Low traction" light comes on in the car. It doesn't do it very often, but I want to diagnose and fix it asap. Nothing is rubbing and the tires are new. I gave it an oil change this morning and nothing looked out of place down there. My best guess is a wheel bearing, but I'd like to get a little input before doing anything.