Transmission issues, code P0732

I was driving and heard a pop and due to my transmission going out in my other car six months ago I immediately pulled over. I put the car in park and when I went to put the car in drive it would not go anywhere. I put it in reverse and it moves. A few days prior to this I noticed that when I put my car in reverse it hesitated at a little. Two days prior to this I got my oil changed and was going to flush the transmission fluid but they said it looked fine. The code on the reader said p0732. I am just wondering how do I know if it is a solenoid or a transmission issue? Has anyone had any other experience like this. I cannot afford to have my transmission done in the shop. :(