Last weekends I do some maintenance on my car, changed sparkplugs, leaking cam magnet, put adapter plugs, check ecu and o2 sensors plug, no oil on the connector, also I replace trans filter, gasket and leaking connector, with new one and the o-rings.

Today I decided to check TCU connectors, guess what, found oil in the harness, I took the tcu out, clean the connectors, and the harness.

What else do I need to check on the tranny, what other connectors? I'm going to check TCU for codes, CEL its not on.

Tranny problems I see so far, its when it change from 2nd to 1st, its feels hard randomly...

BTW car is.. C230 2005 5speed

Thanks.

 

I'm having some issues with the transmission getting stuck in first gear and rough shifting so I will be having a look at the TCU as well.

I have the same year make as yours so did you find anything else out?

 

My TCU was full of ATF too before I changed the adapter plug.

Just clean it real good and you should be okay.
TCU is pretty much on the lowest part of the car, so fluid can't go anywhere else.
Unlike leaky cam magnet that gravity can pull oil down to O2 sensors.