Theory Of Operation
WARNING: This page is about a different car, the 2009 Dodge Avenger and 2009 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
The Transmission Control Module (TCM) monitors the Transmission Fluid Temperature by the use of two Temperature sensors. One temperature sensor is located in the valve body and the other is located in the TCM. If the TCM detects improper operation this DTC will set.