The gearbox hasn't gone into 'snow mode' as you call it. It's gone into limp home mode as there is a fault with the gearbox. You'll need to get any fault codes read out to establish what the problem is.
It could be that the fluid just needs changing, or the selector switch on top of the gearbox needs stripping down and the internal electrical contacts cleaning and regreasing. As I said though, best to get the fault codes read out which takes away any guesswork.
Edited by Dynamic Dave on 02/03/2009 at 00:09
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