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Home >> Kia >> 2020 >> Optima LX >> Repair and Diagnosis >> External Pages >> Different car >> Section 254 (Dual Clutch Transmission Diagnosis (2 Of 2) - 1.6L) >> DTC P1921-77: Gear 2 System Referencing Failure >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
Trouble Shooting Condition Possible Cause
DTC Strategy
  • Monitoring maximum length of left/right gear shift motor 2
  1. Faulty DCT
  2. Mechanical failure on gear 2 Shift direction
Enable Condition
  • Gear shift motor 2 hall sensor is normal when reference point is found during engine cranking
Threshold Value
  • Maximum motion of gear shift motor 2 is less than 19.4mm or greater than 22mm
Detecting Time
  • 3 times
Fail Safe
  • Drive at Odd gear (1/3/5/7)
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