Is there a way to view fault codes & history from my ECM and TCM without going to the dealer? I hear a lot of people talking about specific ones, but how do you see them?

You have to have a scanner that reads codes, like a Predator. Or a shop that has a tech 2, Genysis, Snap On, or other scanner.

Predator will not read TCM. But it will, realtime monitor, PCM.

I think your local Advance or Auto Zone parts will read them for free.