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What does a TCU transmission control unit failure mean?

1 Answers

VonRhett

07/30/25 10:53am

TCU is the automatic transmission control system. Every vehicle equipped with an automatic transmission will typically have a TCU. A TCU failure indicates a problem with the automatic transmission, and it is recommended to take the vehicle to a repair shop for diagnosis. The shifting of an automatic transmission is controlled by commands from the TCU, which are then executed by the electro-hydraulic system to complete the gear change. Relevant information about the transmission is as follows: 1. Introduction: A device that changes the speed ratio and direction of motion. It is used to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. A gear-driven transmission generally consists of a housing and several gear pairs. 2. Function: During driving, to adapt to different conditions, the vehicle's driving force and speed need to vary within a certain range. However, the existing engine's torque and speed variation range cannot meet this requirement, hence the transmission is installed.

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