LANE DEPARTURE ALERT SYSTEM, Diagnostic DTC:U0101, U0123, U0126, U0129, U0142, U0155

DTC Code DTC Name
U0101 Lost Communication with TCM
U0123 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication With Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0142 Lost Communication with Body Control Module "B"
U0155 Lost Communication with Combination Meter

DESCRIPTION

These DTCs are output when a communication malfunction occurs between the sensors and ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0101 Lost Communication with TCM 2 seconds after the ignition switch is turned ON, the vehicle is being driven at 1 km/h (1 mph) or more, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • ECM

  • Forward recognition camera
U0123 Lost Communication with Yaw Rate Sensor Module 2 seconds after the ignition switch is turned ON, the vehicle is being driven at 1 km/h (1 mph) or more and a communication error between the yaw rate sensor and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Yaw rate sensor (airbag sensor assembly)

  • Forward recognition camera
U0126 Lost Communication With Steering Angle Sensor Module 2 seconds after the ignition switch is turned ON, a communication error between the steering sensor and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Steering sensor

  • Forward recognition camera
U0129 Lost Communication with Brake System Control Module 2 seconds after the ignition switch is turned ON, a communication error between the skid control ECU and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • skid control ECU (brake actuator assembly*1 or master cylinder solenoid*2)

  • Forward recognition camera
U0142 Lost Communication with Body Control Module "B" 2 seconds after the ignition switch is turned ON, a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Main body ECU (Multiplex network body ECU)

  • Forward recognition camera
U0155 Lost Communication with Combination Meter 2 seconds after the ignition switch is turned ON, a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more.

  • CAN communication system

  • Combination meter assembly

  • Forward recognition camera

PROCEDURE


  1. CHECK FOR DTCs (LANE DEPARTURE ALERT SYSTEM)


    1. Clear the DTCs.

      Click here

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

      Tech Tips

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

    3. Check the DTCs.

      Click here

      Result
      Result Proceed to
      DTC U0101, U0123, U0126, U0129, U0142 and U0155 are not output A
      DTC U0101, U0123, U0126, U0129, U0142 or U0155 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here