How do you diagnose DTC Uxxxxx codes on a 2011 Dodge Nitro R/T 4.0L ?

What is your question?

I first heard a temp. humming sound after cutting vehicle off. All dash lights came on, Trac Control light comes on, Engine light Comes on, When pulling off, gear is hesitant to change (stuck in 1st). Problem occurred every other day.

What makes this problem better or worse?

It's worse when it's cold

How long has your 2011 Dodge Nitro had this problem?

Since Jan, 2019