Description: The Kia Transmission Controller (954A1-2D392) is a factory-original TCM for 2021–2023 Kia Seltos 1.6L models. It governs automatic transmission operation, managing shift timing, clutch engagement, and gear selection to optimize performance, fuel efficiency, and driving smoothness. A genuine Kia OEM controller that requires programming to the specific vehicle and is built to original communication and control specifications.