Transmission help

[Wave]

That would be located in with the shifter cover ?

[06T200]

The TCM is located right above your right foot under the dash. The grounds as I recall are the one on the starter bolt (under the car) and one by the fuse box under the hood and possibly another point.

The connectors are all outlined on the schematics, you may need to check them all. C101 for example, I know from experience can get wet when it rains, and rain will drip onto it and eventually the connection can get dicey. C101 carries the canbus traffic between the TCM and the ECM, (issues with this circuit present a U0100 DTC) and it also carries the backup light circuit, so dicey backup lights can be a clue it's a bad/dirty connection possibly. There are a few connector point, but I have only had trouble with C101 under the coolant tank under the hood. Once you know you have solid connections and grounds, then you can throw parts and money at it if nothing comes up.