If the codes pop up with key on, engine off (before starting the engine in other words) then you have an electrical issue for sure.

My suggestion is to pull items off the main harness one at a time - key on and see if one of those items removed "fixes" your problem for the time being.

Example - pull each O2 connector (upstream and down stream - left and right if equipped) from the main harness and key on, engine off.

Try this for the ABS or RWAL sensor, etc.

When you get your new harness assembly for inside the trans you can simply connect it to the plug that enters the trans and ground the OD & lockup solenoid assembly body ( the part that bolts to the side of the valve body) making sure all your sensors are plugged in to this new harness assembly. Key on, engine off. If fixed something is bad in the old internal harness assembly. I PM'd you -