My wife has a 07 dodge nitro 4x4 with the 3.7L motor, for the second time it is having a check engine light, no shifting (stuck in 1st gear) and weird lights going on and off (the drive selector lights). The dealership replaced a module and a relay of some sort, and problem fixed for 6mos. Now its back! my concern is something upstream causing these parts to fail, or just lots of bad parts. Anyone have an idea as to what it could possibly be?? I need to get a little kick start as to where to look, perhaps someone has experience with this? any suggestions would be appreciated, thanks.