M1123 Plug under rear L/H seat?

[alwayskaos]

So my M1123 is in process of getting running and back together, and Ive searched quite a bit thru the manuals, but can't seem to figure out what the large canon plug under the L/H back seat is. The canon plug is there....but nothing else. Please let me know if you know what it is. Thank you!

 

[NDT]

Transmission controller sounds like

 

[alwayskaos]

So it does look like the TCM. Is there a specific TCM for a 2015 M1123? I found the info in a manual of what it is, just not the part number.

 

[NDT]

12460423-5 / 01-519-9367 2520-01-519-9367 - MODULATOR, TRANSMISSION (WITH PTC TCM) [TURBO] | Hummer Parts Guy (HPG)