I have started seeing the low traction light come on in the morning in my '99 alero. This seems to have only started once it has gotten cold outside for winter. It seems to happen only once after I back out of the driveway and onto the street as I am almost stopped in reverse. Once I get underway, I can't recall seeing the light come on again. It seems to be only when cold. Could this be a bad sensor or bearing. Anyway to find out which if it happens once per trip?