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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 U0164: Lost Communication With HVAC Control Module >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • FATC CAN signal confirmation
  1. Open or short in CAN communication
  2. Faulty FATC
Enable Conditions
  • 2 seconds later after IG KEY ON
Threshold Value
  • No CAN message from FATC
Diagnosis Time
  • 0.5 seconds
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