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Home >> Kia >> 2020 >> Optima SX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (Dual Clutch Transmission Diagnosis - 1.6L (2 Of 2) (Except HEV)) >> DTC P0921-77: Gear 1 System Referencing Failure >> General Information >> General Description

General Information: General Description

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The DCT system uses two clutches and two clutch motors. The TCM operates clutch and uses clutch motor to select optimum gear for driving conditions.