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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 U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> DTC Information >> DTC Description

DTC Description

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When the TCM cannot read the data from the ESP through the CAN-BUS line, the TCM sets this code.