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 sensor.

DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
U0129

  1. Ignition switch ON

  2. No communication between the ECM and Skid Control ECU.

  3. 2.4 seconds

  4. 1-trip detection logic

  • CAN communication system

  • Brake actuator assembly

    (Skid control ECU)

  • ECM

PROCEDURE


  1. CLEAR DTC AND PERFORM ROAD TEST


    1. Clear the DTCs after recording the freeze frame data and DTCs Click here.

      Tech Tips

      Write down the currently output DTCs before clearing them.

    2. Start the engine, drive at a low speed and perform the inspection.


    NEXT

  2. CHECK DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.

    5. Read the DTCs using the tester.

      Result
      Result Proceed to
      U0129 is not output A
      U0129 is output B

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here