Theory Of Operation
WARNING: This page is about a different car, the 2012 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.
After initial vehicle start, the Transmission Control Module (TCM) looks for a message over the CAN BUS verifying vehicle information which is crucial for transmission configuration. After the information is received it is stored in the EEPROM of the TCM. If the TCM does not receive a valid configuration within a predetermined time, the DTC will set and the MIL will be illuminated.