just got a new XC90 3.2 AWD. Our driveway is quite steep. As I was going uphill two days ago I had to stop to move a fallen tree limbout of the way. Driveway was covered with icy snow. When I resumed trying to go up hill the car slid backwards into a snow bank. Pushed the "W" button but it didn't seem to help any. Right front & rear tires just spun. Nothing seemed to happen using the "W" button. No action with left side front or rear wheels. Finally got unstuck when I threw sand under all the tires. Why didn't the left wheels pull the car? What's wrong(besides that I didn't buy a real 4WD)?
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