Transmissions codes

The codes you have suggest both electrical and internal issues with the transmission.

First thing to check is the CLSTR fuse in the dash fuse box. If it blows it can cause some of these codes. If it has blown, check the wiring harness from the transmission to the fuse box for physical damage/shorting. Many of the other codes suggest harness problems as well, you may also want to unplug the harness connector on the transmission and spray some contact cleaner in it and re-connect it a couple times as corrosion could be causing a poor connection.

Next you have a code that suggests you also have some mechanical issues in the transmission being caused by contaminated fluid. For it a flush and new filter should take the contaminates out.

The fuse powers a lot. Not just the transmission but the instruments as well.

DTC P0756
The code does not say "contaminated fluid" per se. Instead the code is most often caused by contaminants in the fluid blocking the valves from moving correctly.

From a TSB on it -
"The most likely cause is chips/debris plugging the filtered AFL oil at orifice number 29 on the top of the spacer plate. This is a very small hole and is easily plugged by a small amount of debris. It is important to remove the spacer plate and inspect orifice number 29 and the immediate area for the presence of chips/debris. Also, the transmission case passage directly above this orifice and the valve body passage directly below should be inspected and cleaned of any chips/debris."

That is why I suggested the flush, filter and fill. The flush may wash the crud out without needing to take the valve body out. It is an easy first test.

Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken

Great that you found it. I would not feel foolish, find me anyone who has not made an oops or twenty over the years. I will not hold my breath waiting.

The contaminants that matter are small, but as the connector was off I would bet that they were all false codes.