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Home >> Hyundai >> 2019 >> Sonata Plug-In Hybrid >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (3 Of 3) (PHEV) >> 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 2 Signal monitoring
  1. Poor connection
  2. Open or short in CAN communication line
  3. Faulty HCU
Enable Conditions
  • Ignition switch is on
  • Battery voltage is between 9V and 16V
Threshold Value
  • No message from HCU for 100msec.
Diagnosis Time
  • 0.5 sec.
MIL On Condition
  • 2 driving cycle
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