So, my ABS light has been on for about a year or so. It's been pretty cold here in MD lately and I notice that when I go out to the car in the morning, the ABS light is off. Hit the brakes hard and sure enough the abs is pumping the brakes like a champ but after a bit of driving the ABS light is back on and not working. Not sure what that means just yet, maybe the cold weather constricts something that allows a circuit to be completed but once it warms up it expands and fails.