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The Transmission Computer (TCM/TCU) controls automatic transmission shifting, torque converter lockup, and gear selection. A failing TCM causes harsh shifting, stuck gears, limp mode, and transmission warning lights.
TCM replacement typically requires programming to match your vehicle. Some used TCMs from identical vehicles may work plug-and-play. The TCM is often located on or near the transmission, or inside the vehicle near the ECU. Always verify programming requirements before purchase.