Transmission Control Module (TCM): Notes
NOTE:
The TCM is also known as the secondary on board diagnostic module C (SOBDMC). Select SOBDMC on the scan tool for access to TCM functions.
The microprocessor that controls operation of the transmission is called the TCM. The TCM is a stand alone module. The TCM receives a variety of controller area network (CAN) messages and hardwired signals from modules connected to the CAN. Based on information received, the TCM makes a decision on how to control the operation of the generator motor or the traction motor. In case of a concern, the TCM is able to detect and store the appropriate DTC. The DTCs can be retrieved from the TCM by carrying out an on demand or continuous memory self test. The TCM can be reprogrammed. The TCM controls the motor electronics cooling system pump as well as the electric auxiliary heater and transmission auxiliary oil pump (plug in vehicles only).