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Normal Operation and Fault Conditions

With the ignition ON, the EPB module sends messages to the ABS module over the HS-CAN 2. If the ABS module does not receive these messages within the specified time frame, the ABS module sets DTCs. This can be due to a EPB module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the EPB module, refer to  Anti-Lock Brake System (ABS) And Stability Control  Description and Operation. 

PPT SA - ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0128:00 Lost Communication With Park Brake Control Module: No Sub Type Information With the ignition ON, the EPB module sends messages to the ABS module over the HS-CAN2. If the ABS module does not receive these messages within the specified time frame, the module sets a DTC. This can be due to a EPB module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the EPB module, refer to Anti-Lock Brake System (ABS) And Stability Control , Description and Operation.

Possible Causes 

NOTE: The EPB module is also known as the PBM.
Fig 1: Antilock Braking System (ABS) Module Connector - C135
G11681986Courtesy of FORD MOTOR CO.

Harness Side

  1. SA1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON, engine OFF.
    • Using a diagnostic scan tool, carry out the Network Test.
    • Does the EPB module pass the Network Test? 
      Yes No
      Go to  SA2. DIAGNOSE the no communication with the EPB module.
      REFER to Module Communications Network .
  2. SA2: CHECK THE ABS CMDTCS 
    • Clear the ABS DTCs.
    • Ignition OFF.
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Retrieve and record the ABS module DTCs.
    • Is DTC U0128:00 retrieved again? 
      Yes No
      Go to  SA3. If no DTCs are present, the system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
      For all others, Go to the DTC Chart: ABS Module.
  3. SA3: REVIEW THE RECORDED DTCS FROM THE ABS MODULE SELF-TEST 
    • Review the recorded DTCs from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 recorded? 
      Yes No
      For DTC U3003:17, Go to PINPOINT TEST F .
      For DTC U3003:16, Go to PINPOINT TEST A .      		 Go to  SA4.
  4. SA4: CHECK FOR DTCS IN THE EPB MODULE 
  5. SA5: CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN 
    NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
    • Check the vehicle service history for recent service actions related to the EPB or ABS module. If recent service history is found:
      • Verify the correct replacement module was installed - HVBOM may be used to verify correct part fitment.
      • Verify the configuration of replacement module was correct - re-configure the module using as-built data if prior configuration is suspect.
      • Verify the module was not obtained from a like vehicle and installed into customer vehicle - return the swapped module to source vehicle and obtain new replacement module.
    • Operate the system and determine if the observable symptom is still present.
    • Is the observable symptom still present? 
      Yes No
      Go to  SA6. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  6. SA6: CHECK FOR DTC U0128:XX SET IN OTHER MODULES 
    • Retrieve the continuous memory DTCs.
    • Is DTC U0128:xx set in 1 or more modules in addition to the ABS module? 
      Yes No
      Go to  SA7. Go to  SA8.
  7. SA7: CHECK FOR CORRECT EPB MODULE OPERATION 
    • Ignition OFF.
    • EPB Module connector disconnected.
    • ABS Module connector disconnected. (C135)
    • Disconnect all in-line electrical connectors between the ABS module and the EPB module.
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Connect all in-line electrical connectors between the ABS module and the EPB module. Make sure the connectors seat and latch correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • EPB Module connector connected. Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      CHECK OASIS for any applicable TSBs.
      If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.
      If no TSBs address this concern, INSTALL a new EPB module.
      REFER to Parking Brake System - Parking Brake And Actuation B.      		 The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
  8. SA8: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • EPB Module connector disconnected.
    • Disconnect all in-line electrical connectors between the ABS module and the EPB module.
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Connect all in-line electrical connectors between the ABS module and the EPB module. Make sure the connectors seat and latch correctly.
    • EPB Module connector connected. Make sure the connector seats and latches correctly.
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
      Yes No
      INSTALL a new ABS module.
      CHECK OASIS for any applicable TSBs.
      If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.
      If no TSBs address this concern, INSTALL a new ABS module.
      REFER to the ABS module Removal and Installation procedure in Anti-Lock Brake System (ABS) And Stability Control .
      ORDER a replacement ABS module and INCLUDE the RVC form.
      If this is a Ford repair, INCLUDE the RVC on the warranty claim form.
      When complete, SELECT the "X" in the top right corner to CLOSE this procedure.      		 The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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