I was driving on the freeway when all of a sudden my Check Engine light and Trac Off light came on. I took it to a mechanic who ran the code and found that it was a Transmission Speed Sensor issue. He ordered the part and upon replacing it found that a rodent had chewed through the wiring. There were rodent droppings as well as multiple chew marks. He replaced the wiring and the sensor, costing me a total of $250!!