CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM, Diagnostic DTC:U0129

DTC Code DTC Name
U0129 Lost Communication with Brake System Control Module

DESCRIPTION

The ECM receives signals sent from the skid control ECU via the CAN communication system. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding ECU or sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
U0129 Lost Communication with Brake System Control Module

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. The ignition switch is ON.

  2. There is no communication between the ECM and skid control ECU.

  3. 2.4 seconds

  4. 1 trip detection logic

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • ECM

 Comes on DTC stored

PROCEDURE


  1. CLEAR DTC AND PERFORM ROAD TEST


    1. Clear the DTCs.

      Click here

      Tech Tips

      Write down the currently output DTCs before clearing them.


      Powertrain > Engine and ECT > Clear DTCs

    2. Start the engine and drive the vehicle at a low speed.

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (DTC U0129)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      Powertrain > Engine and ECT > Trouble Codes

    5. Read the DTCs using the GTS.

      Result
      Proceed to
      U0129 is not output
      U0129 is output

    U0129 is not output

    CHECK FOR INTERMITTENT PROBLEMS Click here

    U0129 is output

    GO TO CAN COMMUNICATION SYSTEM (DIAGNOSIS SYSTEM) for LHD: Click here
    Click here for RHD: Click here