Even though you do not have a code for it I would try an input shaft speed sensor. If that does not fix it the transmission is probably bad.
Here is a video that will help you see what to do to get the transmission out (different car but the process is the same) and diagrams below to show you on your car:
https://youtu.be/6N6b5F2ChyE
Check out the diagrams (below). Please let us know what happens.
Images (Click to make bigger)
Monday, October 22nd, 2018 AT 10:08 AM