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Home >> Kia >> 2009 >> Borrego Limited, 4WD >> Repair and Diagnosis >> Transmission >> Transfer Case Assembly >> U0121 Lost Communication With Anti-lock Brake System (ABS) Control Module >> DTC Detecting Condition

U0121 Lost Communication With Anti-lock Brake System (ABS) Control Module: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item Detecting Condition Possible cause
DTC Strategy
  • CAN Signal Check
  • Poor Connection
  • Power supply to each module
  • Open or short in CAN communication line of PCM
  • Open or short in CAN communication line of TCCU
  • Faulty 120Ω register (Cluster)
  • Faulty PCM
  • Faulty ABS
Enable Conditions
  • IG ON
Threshold value
  • No CAN message from ABS for more than 1sec.
MIL ON Condition
  • Lamp ON
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