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Home >> Kia >> 2021 >> K5 GT >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis - 2.5L (15 Of 16) >> DTC U0121-F1: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> DTC Information >> DTC Detecting Condition
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DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Check CAN communication with ABS
  • Poor connector connection
  • CAN communication circuit
  • HECU
Enable Conditions
  • Battery voltage is between 9 and 16V
  • Time after Ignition "ON" is greater than 1s
  • Engine speed is greater than 32RPM
Threshold Value
  • CAN message lost from HECU
Diagnostic Time
  • Continuously
MIL ON Condition
  • 2 driving cycle
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