I never use the "M" position on my car, only to initially test it out when I bought it. Supposedly this is used to lock the gear into say, #3, so that you can pull away in snowy/icy conditions without losing control. I live in a snow area and have never, ever felt the need to use the "M" position. If my switch ever malfunctioned, it would have to be very cheap for me to get it fixed. As long as it still worked in the "A" (normal) position, I probably wouldn't consider fixing it. Just my opinion.