I'm getting code P0748 after a tranny swap(new/used tranny was road tested so its good) I'm thinking its the 8 pin plug wire that's on the top/side of tranny. Anyone know how to test this plug in, what the volts should be going to transmission I think there may be a broken wire somewhere. I also got a code P0132

 

the only way i know to test that wire is to plug your truck in to a diagnostic tool and drive with it scanning. Those wires are famous for getting a small crack in them where they go into the tranny, oil gets into the wires and will give the tranny weird symptoms.