Theory Of Operation
WARNING: This page is about a different car, the 2010 Dodge Avenger and 2010 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
The Transmission Control Module (TCM) monitors the operation of all pressure control solenoids and pressure switches. If a fault is detected during testing, the TCM will set this DTC and illuminate the MIL.