2015 renegade trailhawk. From park it will shift to any gear. If its put in reverse the shift release button on the knob is pulled in. Can not put it in park from reverse. Will go to any other gear and when in neutral or drive it will go up into park, yet when passing through reverse you can feel the selector having difficulty. How does the shift knob assembly work? Why is it hanging when in reverse? Easy fix or is it another trip to the dealer?