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Home >> Kia >> 2020 >> Optima SX >> Repair and Diagnosis >> External Pages >> Different car >> Section 254 (Dual Clutch Transmission Diagnosis (2 Of 2) - 1.6L) >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
Trouble Shooting Detecting Condition Possible Cause
DTC Strategy
  • CAN Communication Monitoring
  1. Poor Connector Connection
  2. Faulty C-CAN Communication Circuit
  3. Faulty HECU
  4. 120Ω resistance (BCM, ECM)
Enable Condition
  • Battery voltage is higher than 10V
  • 0.5s after ignition "ON"
Threshold Value
  • Not receive a CAN message from HECU
Detecting Time
  • 2s
Fail Safe
  • Inhibited learning control
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