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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Active Air Flap-Left Diagnosis (HEV) >> DTC U0100: Lost Communication With ECM/PCM 'A' >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • CAN signal confirmation
  1. Poor connection at each module connector.
  2. Open or short in CAN communication.
  3. Faulty ENG ECU.
Enable Conditions
  • IG "ON" or Engine "ON"
Threshold Value
  • No signal regarding EMS 1/2/5 CAN message
Diagnosis Time
  • 2seconds.
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