Ok so I noticed my check engine light came on and I hooked up my engine scanner and it comes out with P0753. I googled it and it says shift solenoid A electrical. So I changed the wire harness for both solenoids under the pan. And still wont shift.

 

Did you change the solenoid?

 

P0753 Trans 3-4 Shift Solenoid/Trans Relay Circuits

Check that the relay is good, change the solenoid and reset the pcm.