Michael,

Thanks for the help. I disconnected the battery for five minutes and reconnected. The 4matic light went out and the 4 wheel drive worked. I spent 3 hours on snow covered roads this weekend in the northeast. The car had good traction and handled well.

The 4matic light hasn't blinked any codes since the reset. I did notice prior to the light coming on last week, after the car started the light would blink once. Anyone know the significance of this?

Anyway, I appreciate the help. Hopefully it will continue to work through the winter.