UPDATE... Finally back from vacation and back to the X. Diagnosed a bad TCM, replaced it with another from same month/year production 4.6IS.Starts up and drives now, but goes into TransFailSafe as soon as I start moving. I've heard differing opinions on needing to code the TCM to the vehicle. Do I need to, is this what is causing my limp-mode? Or is my transmission toast as well? Any help would be appreciated...

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Current-

--2003 X5 4.6
Estoril Blue
Black Nappa leather
rear air bags
OEM nav
OEM hitch
OEM cargo liner
Black housing SPYDER headlights - Evo-XR projectors

2017 GMC Sierra, 7K miles...
2017 GMC Sierra, 60K miles...
2015 GMC Sierra 280K miles...
2011 GMC Sierra, 500K miles...

Previous wheels:

--First love~
1969 Chevy C10, 396BB bored, 3 on the tree, Black ~SOLD~

--2011 Chevy Silverado LT 2500HD CCSB, Black, 250K miles ~SOLD~