Replaced TCC valve, now transmission will not engage any gear?

Is the main transmission wiring connector in good shape and connected? You could have a fluid filter that has come out of the front pump, so the unit is not picking up fluid. Let's run the codes to see what comes up and please follow these guides:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-diagnose-and-fix-an-automatic-transmission-that-wont-engage-gears

Please go over these guides and get back to us.