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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Autonomous Emergency Braking (AEB) System Diagnosis (HEV) >> DTC C1646-81: CAN Message Failure - TCU >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Monitoring CAN messages
  1. Faulty Gear position system (Inhibitor switch)
  2. Faulty TCM system
Enable Conditions
  • Engine run
  • It has 2 seconds delay after ignition switch is on.
  • Battery voltage is between 9 volt and 16 volt.
  • No CAN Bus off
Threshold Value
  • When it received abnormal gear position message (Invalid) from TCM via CAN.
Diagnosis Time
  • 500 milliseconds
Fail Safe
  • SCC/AEB Disengagement/Shutdown
  • SCC/AEB Warning lamp turns 'ON'
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