One problem related to transmission not engage has been reported for the 2006 Nissan Sentra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Nissan Sentra based on all problems reported for the 2006 Sentra.
I own a 2006 Nissan Sentra. While driving approximately 35 mph and when I was waiting at a traffic light the gear shifted from drive to neutral after I slightly bumped against the gear shift with my arm. When I checked to confirm that it could be moved without engaging the button on the side of the gear shift I was able to shift from one gear to another without engaging the button. It appeared that the vehicles gear shift was only designed to change gears when the button on the side of the gear shift was engaged. That is a safety issue and the potential for a crash if the gear shift can easily be without engaging the button that was intended for that function. The 5-cd disc player has also stopped functioning to the point where I am unable to remove the cds that are lodged inside the player. I can only assume that they have melted inside and that is the potential for a fire. I have not notified the dealer or manufacturer of these failures at this time.