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Possible Causes

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. BJ1: CHECK THE COMMUNICATION TO THE IPC (INSTRUMENT PANEL CLUSTER) 
    • Ignition ON.
    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle. NOTE: DTC s may bedisplayed from previous diagnostic actions.
    • Using a diagnostic scan tool, perform a network test.

    Do the IPC pass the Network Test? 

    Yes No
    DIAGNOSE the IPC DTCs. REFER to INSTRUMENTATION, MESSAGE CENTER AND WARNING CHIMES .
    If there are no IPC DTCs, GO to  BJ3    		 Go to  BJ2.
  2. BJ2 CHECK THE GWM (GATEWAY MODULE A) COMMUNICATION 
    • Ignition ON.
    • Using a diagnostic Scan tool, carry out the network test.
    • Using a diagnostic scan tool, retrieve the DTC s from the vehicle. NOTE: DTC s may bedisplayed from previous diagnostic actions.

    Does the GWM pass the network test? 

    Yes  DIAGNOSE the IPC does not communicate with the diagnostic scan tool. Refer to COMMUNICATIONS NETWORK .
    No  DIAGNOSE the GWM does not communicate with the diagnostic scan tool. Refer to COMMUNICATIONS NETWORK .
  3. BJ3 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DTC (DIAGNOSTIC TROUBLE CODE) 
    • Using a diagnostic scan tool, carry out the ABS self-test
    • RECORD all ABS  module DTCs.
    • Using a diagnostic scan tool, clear the ABS  DTCs.
    • Disconnect the diagnostic scan tool, exit the vehicle, close all door and wait 10 minutes for all module to completely shut down.
    • Ignition ON.
    • Carry out the ABS  self-test.

    Are any of the DTCs listed in the Fault Trigger Conditions Table retrieved again? 

    Yes  Go to  BJ4
    No  The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  4. BJ4 CHECK FOR VOLTAGE DTC (DIAGNOSTIC TROUBLE CODE) IN THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE 
    • Review the recorded DTCs from the ABS  module self-test.

    Is DTC U3003:16 or U3003:17 present? 

    Yes  For DTC U3003:16, GO to Pinpoint Tests A 
    For DTC U3003:17, GO to Pinpoint Tests F 
    No  Go to  BJ5
  5. BJ5: CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) IN THE GWM (GATEWAY MODULE A) 
    • Using a diagnostic scan tool, carry out the GWM self-test
    • RECORD all DTCs from the GWM self-test

    Are any DTCs present in the GWM? 

    Yes No
    DIAGNOSE the GWM DTCs. REFER to COMMUNICATIONS NETWORK . Go to  BJ6.
  6. BJ6: CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) IN THE IPC (INSTRUMENT PANEL CLUSTER) 
    • Using a diagnostic scan tool, carry out the IPC  self-test

    Are any DTCs present in the IPC? 

    Yes No
    DIAGNOSE the IPC DTCs. REFER to INSTRUMENT PANEL AND INTERIOR SWITCHES ILLUMINATION . Go to  BJ7.
  7. BJ7: 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 IPC or the 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  BJ8. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  8. BJ8: CHECK FOR COMMUNICATION DTC (DIAGNOSTIC TROUBLE CODE) IN OTHER MODULES 
    • Ignition ON.
    • Using a diagnostic scan tool, retrieve the DTCs from the vehicle.
      NOTE: DTCs may be displayed from previous diagnostic actions.

    Is DTC U0155:xx set in 1 or more modules in addition to the ABS module? 

    Yes No
    Go to  BJ9. Go to  BJ10.
  9. BJ9: CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION 
    • Ignition OFF.
    • Disconnect the diagnostic scan tool, exit the vehicle, close all doors and wait 10 minutes for allmodules to completely shut down.
    • Disconnect IPC C220
    • Disconnect GWM  C2341.
    • Disconnect ABS  Module C135
    • 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 IPC C220 . Make sure the connector seats and latches correctly.
    • Connect GWM  C2341. Make sure the connector seats and latches correctly.
    • Connect ABS  Module 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
    CHECK OASIS for any applicable service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles exist for this concern, INSTALL a new IPC. Refer to INSTRUMENT PANEL CLUSTER (IPC) . The system is operating correctly at this time. The concern may have been caused bya loose or corroded connector. ADDRESS the root cause of any connector or pinissues.
  10. BJ10: CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION 
    • Put the ABS  module in sleep mode by performing the following steps:
      • With ALL doors closed, set the ignition from ON to OFF.
      • Disconnect the diagnostic scan tool.
      • Open the door, exit the vehicle and close the door.
      • Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
    • Ignition OFF.
    • Disconnect ABS  module C135
    • Disconnect IPC C220
    • Disconnect GWM  C2341.
    • 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 ABS  Module C135 . Make sure the connector seats and latches correctly.
    • Connect IPC C220 . Make sure the connector seats and latches correctly.
    • Connect GWM  C2341. 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 service articles: TSB , GSB , SSM or FSA . If a service article exists for this concern, DISCONTINUE this test and FOLLOWthe service article instructions.
    If no service articles address this concern, INSTALL a new ABS module. REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
    INSTALL a new Anti-lock Brake System (ABS) module.    		 The system is operating correctly at this time. The concern may have been caused bya loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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