This seems to happen on cold mornings when I start the V90 up. It will show a blinking Winter mode arrow on the dash and the W S E buttons/lights near the shifter will blink. It will alternate from W to E to W to E etc or if i hit S it will alternate with S. If you repeatedly turn the car on and off it will go away after a few times although I dont know why. When it's like this its as if its in a low gear all the time, very sluggish. Any ideas as to the problem? I've tried getting a new W S E switch but that didnt help.

Mr. Bowers gave excellent advice. The shift position module is probably it. Another cause could be the speed sensing module beginning to fail, although a PNP module fialure is much more common. Had both fail on my S90 and I'm happy to say that the car is history.

I haven't had the problem, but from reading other posts, it sounds similar to the symptoms of a dying "PNP" switch. Can you temporarily "cure" it by moving the shift lever through its full travel several times? (From "P" to the other end.)

The switch is on the passenger's side of the transmission with the exhaust system partially hiding it. It tells the transmission ECU where the shift lever is positioned. The switch is connected to the electricals at one of the plugs on the driver's side. The switch is expensive and the exhaust system makes changing it a b#$@h, I'm led to believe. People have said they changed it without moving the exhaust but I don't think I'd like to try it on my car.