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Home >> Hyundai >> 2021 >> Ioniq Plug-In Hybrid SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (3 Of 3) >> DTC U1004: Lost Communication With Hybrid Powertrain Control Module (H-CAN) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • CAN communication status check
  1. Poor connection
  2. CAN communication line between ECM and HCU
  3. HCU faulty
Enable Conditions
  • IG ON
Threshold value
  • No message time from HCU via external CAN
Diagnosis Time
  • Continuous
MIL On Condition
  • 2 driving cycle
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