When you say TCU, I assume you mean the transmission control unit? If so, they call this a TCM which is actually the mechatronic unit which is basically the valve body inside the oil pan.
I am attaching the info below on this unit so please take a look at it and let me know if you have questions on this.
Thanks
Images (Click to enlarge)
Sep 6, 2021 at 7:23 PM