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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) - HEV >> DTC U1004: Lost Communication with Hybrid Powertrain Control Module-H-CAN >> General Information >> DTC Detecting Condition
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General Information: DTC Detecting Condition

Item Detecting Condition Possible cause
DTC Strategy
  • No message from HCU at CAN
  1. Poor connection
  2. CAN communication
  3. Open or short in ESC communication line
Enable Conditions
  • Time exceeded with no Message
Threshold value
  • No message during 100m sec
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