Transmission Control Module (TCM)

Fig 1: Identifying Transmission Control Module (TCM)

Courtesy of VOLVO CARS CORPORATION

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 P or N. The remote key cannot be removed from the start control module (SCU) if the gear selector is not in position P.