Re: Service ESC
It's funny, we had a very snowy and icy winter and I think I noticed the ESC activate once or twice the whole winter. It's a great system, but it only activates when the car goes into a real skid. I thought with all the snow and ice, I would have seen the message more, but all I ever saw was the Traction Active message.
I will say the Malibu is a heavy car, so it's very stable on the road, even in the snow and ice.
Anyway, most of the time, these problems are sensor related. A sensor probably just needs to be replaced.