TCU transmission control unit explained?

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A transmission control unit (TCU) is an electronic device that controls and regulates the shift points of an automatic transmission in a vehicle. The TCU collects data from various sensors, including throttle position, engine speed, and vehicle speed, to determine when it is necessary to shift gears. The TCU then sends signals to the transmission solenoids to engage and disengage the clutches and bands that control the gears.