This just happened on my 2007 5. 9 liter Dodge Quad Cab 4x4. I Started the truck, went to put in gear, stepped on the brake, but shifter would not move. I went in the house came out, and it rolled right into drive. I wondered if there is a sensor for fluid temp on cold days, or fluid movement through lines. Anyone else have this problem? Any feedback would be helpful. It was fine rest of day after it was warmed up.