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Home >> Jaguar >> 2019 >> XJR575 >> Repair and Diagnosis >> External Pages >> Different car >> Section 136 (Automatic Transmission/Transaxle - Vehicles With: 8HP45 8-Speed Automatic Transmission RWD -- XJ/X351) >> Automatic Transmission/Transaxle - Vehicles With: 8HP45 8-Speed Automatic Transmission RWD >> Description And Operation >> Transmission Description (G2257834) >> Description >> Transmission Control Module

Transmission Control Module

WARNING: This page is about a different car, the 2019 Jaguar XJ and 2018 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Control Module (TCM) is an integral part of the mechatronic valve block which is located at the bottom of the transmission, within the fluid pan. The TCM is the main controlling component of the transmission.

The TCM processes signals from the transmission speed and temperature sensors, Powertrain Control Module (PCM) and other vehicle systems. From the received signal inputs and pre-programmed data, the module calculates the correct gear, torque converter clutch setting and optimum pressure settings for gear shift and lock-up clutch control.

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