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Transmission Control Modules are electronic devices found in vehicles that are responsible for controlling the transmission system. These modules use inputs from various sensors to determine the optimal shift points for the transmission, ensuring smooth and efficient operation. They also monitor factors such as vehicle speed, engine load, and throttle position to make real-time adjustments to the transmission's performance. Additionally, Transmission Control Modules can store diagnostic trouble codes to help mechanics identify and troubleshoot issues with the transmission system.