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What is TCU in a car?

1 Answers

ColtonLee

07/30/25 12:20am

TCU is the automatic transmission control system, and every model equipped with an automatic transmission will basically have a TCU. The shifting of an automatic transmission relies on commands issued by the TCU, which are then executed through the electro-hydraulic control system to complete the shift. A good automatic transmission not only depends on the transmission itself but also largely depends on the shifting logic of the TCU. The following are the functions of the TCU transmission control system: 1. The transmission control module helps the transmission decide when and how to shift by collecting information from various sensors and the engine control module, thereby improving performance, ensuring smooth shifting, and saving fuel consumption. 2. The Malfunction Indicator Lamp (MIL), also known as the Check Engine Light, illuminates a yellow or red engine symbol on the dashboard when the control module detects a fault. This fault code indicates that the powertrain system (ECU) has received a request from the transmission control system (TCU) to illuminate the malfunction indicator lamp. 3. After troubleshooting a car fault, the fault code needs to be cleared. When clearing the fault code, it is essential to strictly follow the specific method designated for the particular vehicle model. Under no circumstances should the method of disconnecting the battery negative terminal be used to clear the car fault code.

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