This genuine OEM Transmission Control Module (TCU/TCM) plays a critical role in managing automatic transmission operation by precisely regulating shifting, providing a smooth driving experience while enhancing overall vehicle performance. Designed for seamless compatibility with BMW X3 models from 2004 to 2006, this part adapts to various engine configurations, ensuring optimal functionality. Key OEM part numbers include 7557990, 7557472, and 7542030. This module may resolve issues related to erratic shifting, delayed engagement, or complete failure of transmission response. Engineered to fit within the vehicle's transmission system, this authentic part guarantees reliable performance. Installation requires programming for accurate integration.