DTC    U0129    Lost Communication with Brake System Control Module

for Preparation Click here


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. 2.34 seconds
  4. 1-trip detection logic
  1. CAN communication system
  2. Brake actuator assembly
    (Skid control ECU)
  3. ECM

INSPECTION PROCEDURE

1.CLEAR DTC AND PERFORM ROAD TEST

  1. Clear the DTCs (Click here).

    HINT:
    Write down the currently output DTCs before clearing them.

  1. 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.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs using the tester.
    Result 
    Result
    		Proceed to
    U0129 is not output
    		A
    U0129 is output
    		B



B
GO TO CAN COMMUNICATION SYSTEM (Click here)
A

CHECK INTERMITTENT PROBLEMS (Click here)