I have a 2012 Avenger 3.6 SXT Plus, went to work and the check engine light came on. Stopped at Advance Auto and got the code. It read P0128 - thermostat, car is running a tad cooler than normal. Which has to be the thermostat. Just wanted to make sure before I replace it and to make sure there is only one and not a secondary. I don' have a book.