My car shifter locked into park yesterday once I had pulled over after noticing the D, N, P, R lights were all lit on the dash. I then took off the housing to press the pink button which allowed me to get the car out of park. While trying to merge back on freeway, the car appears to be staying in 1st or 2nd gear, not automatically changing gears. So I can only go 20 miles an hour and the car is struggling. Please Help! It is a 2007 dodge magnum sxt.