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The transmission control module (TCM) in your 2005 Chrysler Pacifica can be found on the passenger side at the front of the engine compartment. It is situated at the end of the wiring connected to the torque converter solenoid. Tracking this wiring will guide you directly to the TCM. If you suspect an issue and the check engine light (CEL) has not come on (common codes like P0700 for Transmission Control System), watch for signs like erratic shifting and the ability to shift into higher gears but struggle to downshift from them.
In the 2005 Chrysler Pacifica, the transmission control module is situated within the transmission towards the back of the casing beneath the rear cover.