PRE-COLLISION SYSTEM, Diagnostic DTC:U0100, U0125, U0126, U0129, U0155

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module

DESCRIPTION

These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM / PCM "A" When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and millimeter wave radar sensor assembly is detected for approximately 5 seconds.

  • CAN communication system

  • ECM

  • Millimeter wave radar sensor assembly
U0125 Lost Communication with Yaw Rate Sensor Module When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the yaw rate sensor (airbag sensor assembly) and millimeter wave radar sensor assembly is detected for approximately 1 second.

  • CAN communication system

  • Yaw rate sensor (Airbag sensor assembly)

  • Millimeter wave radar sensor assembly
U0126 Lost Communication with Steering Angle Sensor Module When the ignition switch is ON, a communication error between the steering sensor and millimeter wave radar sensor assembly is detected for approximately 4 seconds.

  • CAN communication system

  • Steering sensor

  • Millimeter wave radar sensor assembly
U0129 Lost Communication with Brake System Control Module When the ignition switch is ON, a communication error between the skid control ECU (brake actuator assembly) and millimeter wave radar sensor assembly is detected for approximately 3 seconds.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Millimeter wave radar sensor assembly
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module When the ignition switch is ON, a communication error between the combination meter assembly and millimeter wave radar sensor assembly is detected for approximately 8 seconds.

  • CAN communication system

  • Combination meter assembly

  • Millimeter wave radar sensor assembly

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.


      Body Electrical > Pre-Collision 2 > Clear DTCs

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Drive the vehicle at a speed of 5 km/h (4 mph) or more for 8 seconds or more.

    3. Check for DTCs.


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0100, U0125, U0126, U0129 and U0155 are not output A
      DTC U0100, U0125, U0126, U0129 or U0155 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here