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Home >> Hyundai >> 2020 >> Tucson Value, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> 4WD Control Diagnosis >> DTC U0121: Lost Communication With Anti-Lock Brake System (ABS) Control Module >> DTC Information And Inspection >> DTC Setting Condition

DTC Setting Condition

Trouble shooting Condition Possible Cause
Main action
  • Monitor CAN messages
  1. Poor contact of connectors of each communication module
  2. Open/short in the CAN communication circuit
  3. ESC (ESP) ECU
Prerequisite condition
  • Turn the ignition switch on or start the engine
Threshold value
  • An ESC/ESP 1 CAN message is not received
Diagnosis time
  • 2 sec
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