We've been looking for TCM trans temp data since 2009, I don't think it's possible at this point. The TCM knows the data, and uses it to e.g. engage trans limp mode if necessary out around 280-300F IIRC. The dealership can read it with Consult-III, and it's a requirement to do the fluid swap correctly by the service manual procedure (but I've done fine estimating with an IR thermo on the overflowing fluid). But it's just not available via any known OBD-II codes.
What I have in the works (but I still haven't dropped my trans pan to drill and install) is an aftermarket temp sensor into the side of the lower pan.
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