Transmission Control Module (TCM)
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Transmission control module (TCM) (4/28) transmits signals on the CAN network with the position of the gear selector. The central electronic module (CEM) uses this signal to determine if the gear selector is in P or N.
The vehicle can only be started if the gear selector is in position P or N.
For more information, see Design and Function information for the TRANSMISSION CONTROL MODULE (TCM) .