Originally Posted by rcompart

I find that highly unlikely as we get them in quite often with fluid in them and a quick clean up and they are fine. Unless it was plump full, that wasn't what caused your TCU to fail. I'm not sure what changed between when yours worked and when it stopped but I'd look things over before plugging the new one in.

The oil is wicking up through the trans wiring harness. It is a direct result of the trans connector seal failing. Only way to get rid of the fluid is to fix the connector seal.