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See if you can get it into the diagnostic mode. If it does you might find out what's causing the light, and if it doesn't then you almost certainly have a TCM problem. Here's a helpful guide to troubleshooting the TCM if you don't have it already.

That's probably what it is. I read the older posts again and it looks like the light isn't on when it's running, which means it isn't what I had. The only thing that made me think of my issue was the dim light, but that could just be a dirty lens or something.

That trans light behavior is the exact problem I had (along with trans in limp mode). It stayed on whenever the battery was connected but was super dim. Turned out to be a blown up capacitor or something in the TCM. It sounds like your transmission works though, so it might be something else.