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Possible Causes

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
  1. AU1: CHECK THE COMMUNICATION NETWORK 
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the modules communicating on the network.
    • Retrieve the continuous memory DTCs.
    • Do the TCCM and the GWM pass the network test? 
    Yes No
    Go to  AU2. DIAGNOSE the no communication with the AWD module or the GWM. REFER to the Module Communications Network article.
  2. AU2: RECHECK FOR THE ABS MODULE DTCS 

    Carry out the ABS self-test.

    • Ignition OFF.
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

    • Record all ABS module DTCs.
    • Is DTC U0102:xx or U0403:xx retrieved again? 
    Yes No
    Go to  AU3. The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
  3. AU3: CHECK FOR VOLTAGE DTCS IN THE ABS MODULE 
    • Review the recorded DTCs from the ABS module self-test.
    • Is DTC U3003:16 or U3003:17 present? 
    Yes No
    For DTC U3003:17, Go to PINPOINT TEST F .
    For DTC U3003:16, Go to PINPOINT TEST A .    		 Go to  AU4.
  4. AU4: CHECK FOR DTCS IN THE GWM 

    Carry out the GWM self-test.

    • Record all DTCs from the GWM self-test.
    • Are any DTCs present? 
    Yes No
    DIAGNOSE the GWM DTCs. REFER to the Module Communications Network article. Go to  AU5.
  5. AU5: CHECK FOR DTCS IN THE TCCM 

    Carry out the AWD self-test.

    • Record all DTCs from the TCCM self-test.
    • Are any DTCs present? 
    Yes No
    DIAGNOSE the TCCM DTCs. REFER to the appropriate Diagnosis and Testing in the Four-Wheel Drive System article. Go to  AU6.
  6. AU6: 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 TCCM 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  AU7. The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.
  7. AU7: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • Disconnect the ABS module connector.
    • Disconnect the TCCM connectors.
    • 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
    • Are the connectors free of corrosion, damaged pins, bent pins, pushed-out pins and spread terminals? 
    Yes No
    Go to  AU8. REPAIR the connector or terminals. Refer to OEM Connector Repair Procedures article for schematic and connector information.
  8. AU8: CHECK FOR COMMUNICATION DTCS SET IN OTHER MODULES 
    • Connect all TCCM electrical connectors. Make sure they seat and latch correctly.
    • Connect the ABS module connector. Make sure it seats and latches correctly.
    • Ignition ON, engine OFF.
    • Press the Read Vehicle Information button to view the results of the continuous DTCs set in other modules.
    • Retrieve the continuous memory DTCs.
    • Review the CMDTCs from all modules.
    • Is DTC U0102:xx or U0403:xx set in 1 or more modules in addition to the ABS module? 
    Yes No
    INSTALL a new TCCM.
    CHECK OASIS for any 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 address this concern, INSTALL a new TCCM. REFER to the Four-Wheel Drive System article.    		 INSTALL a new ABS module.
    CHECK OASIS for any 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 address this concern, INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
    ORDER a replacement ABS module and INCLUDE the RVC on the form.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
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