Code P0753 which is a 1-2 shift solenoid, I knew my tranny was having some problems like no 1st or overdrive, could this be why? Also can I change this or is that something a tranny shop would need to do, can I get to it from the trans. pan?

 

Well, have a read through the diagnostic sheet and decide for your self:
P0753 - Shift Solenoid A Electrical

And yes, the 1-2 shift solenoid can cause the no 1st or 4th gear. Causes include sediment in the valve, faulty electrical connection to the solenoid, and/or a failed seal on the valve.

This schematic should help if you do decide to get into it: