PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0100, U0123, U0126, U0129, U023A

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0123 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U023A Lost Communication with Front Camera Module

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0100 The pre-crash safety city sensor is unable to receive data from the ECM continuously for 6 seconds or more.

  • CAN communication system

  • ECM

  • Pre-crash safety city sensor
U0123 The pre-crash safety city sensor is unable to receive data from the yaw rate sensor continuously for 1 second or more.

  • CAN communication system

  • Yaw rate sensor

  • Pre-crash safety city sensor
U0126 The pre-crash safety city sensor is unable to receive data from the spiral with sensor cable sub-assembly (steering angle sensor) continuously for 1 second or more.

  • CAN communication system

  • Spiral with sensor cable sub-assembly

  • Pre-crash safety city sensor
U0129 The pre-crash safety city sensor is unable to receive data from the brake actuator assembly (skid control ECU) for 5 seconds or more.

  • CAN communication system

  • Brake actuator assembly (skid control ECU)

  • Pre-crash safety city sensor
U023A The brake actuator assembly (skid control ECU) is unable to receive data from the pre-crash safety city sensor for 2.24 seconds or more.

  • CAN communication system

  • Pre-crash safety city sensor

CAUTION / NOTICE / HINT

Tech Tips

When there is a temperature malfunction in the pre-crash safety city sensor, communication may be lost with the sensor. When this occurs, U023A is output, but communication returns to normal when the temperature returns to normal.

PROCEDURE


  1. CHECK FOR DTCs


    1. Clear the DTCs Click here.

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC U0100, U0123, U0126, U0129 and U023A are not output A
      DTC U0100, U0123, U0126, U0129 or U023A is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here