I have a 2011 AWD CXL which I drove the morning of the last blizzard, "Nemo", and got home before it got bad and parked in the garage. That was Friday morning. On Tuesday morning I went to use the car and when I put it in reverse it would not move. It was stuck. The EPB was disengaging, but the car would not move as if it were stuck to the ground. Called OnStar to run a diagnostic, and nothing was wrong. Called the dealer, they said they never heard of this and if no lights are on in the dash they can't explain, so tow the car in. I called GM road side assistance and there was a flat bed there within the hour. Driver tried to move the car himself and it would not budge. Driver said he could not get the car out because of the angle of the garage and needed to get a tow truck out to drag the car out of the garage and then put it on the flatbed. Second driver came out, a huge guy about 300 pounds, scoots under the car and knocks a couple of this around, gets in the car, puts in reverse and really revs the engine. Car did not move and all of a sudden the car shot out of the garage. Turns out, according to the second driver, that it's very rare, but sometimes humidity and salt would cause the calipers to stick to the rotors on the brakes. I guess the car just needed some man handling to get it on its way. So if ever your car is not going anywhere after you drive in a snow storm, and park the car for a couple of days, you know what's wrong.