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Pinpoint Test BG: U0143

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  1. Normal Operation and Fault Conditions 

    REFER to: Electric Powertrain Control - Component Location .

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    SOBDMC U0143:00 Lost Communication With Body Control Module "C": No Sub Type Information This DTC sets when messages are missing from the BCMC.

    Possible Sources 

    • Communications network concern
    • BCMC

  2. BG1 VERIFY THE CONCERN

    • Ignition ON.

    • Verify there is an observable symptom present.

    Is an observable symptom present? 

    Yes  GO to  BG2
    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. CLEAR the DTCs and REPEAT the self-test.

  3. BG2 CHECK THE COMMUNICATION NETWORK

    • Using a diagnostic scan tool, perform a network test.

    Does the BCMC pass the network test? 

    Yes  GO to  BG3
    No  DIAGNOSE the network concern.

  4. BG3 CHECK FOR NON-NETWORK DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, perform the Inverter System Controller (ISC) self-test.

    Are any non-network DTCs present? 

    Yes  DIAGNOSE all non-network DTCs first. REFER to the appropriate Diagnostic Trouble Code (DTC) Chart .
    No  GO to  BG4

  5. BG4 CHECK FOR NON-NETWORK BCMC (BODY CONTROL MODULE C) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, perform the BCMC self-test.

    Are any non-network DTCs present? 

    Yes  REFER to: Body Control Module C (BCMC) .
    No  GO to  BG5

  6. BG5 RECHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0143

    • Using the diagnostic scan tool, clear the Inverter System Controller (ISC) DTCs.

    • Ignition OFF.

    • Ignition ON.

    • Wait 10 seconds.

    • Using a diagnostic scan tool, carry out the Inverter System Controller (ISC) self-test.

    Is DTC U1043 still present? 

    Yes  GO to  BG6
    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.

  7. BG6 CHECK FOR OTHER CAUSES OF NETWORK COMMUNICATION CONCERN

    • 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 BCMC and the Inverter System Controller (ISC). If recent service history is found:

      • verify correct replacement module was installed, vehicle parts build list may be used to verify correct part fitment.
      • verify the configuration of replacement module was correct, re-configure module using as-built data if prior configuration is suspect.
      • verify the module was not obtained from a like vehicle and installed into vehicle with concern, 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  GO to  BG7
    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.

  8. BG7 CHECK FOR CORRECT BCMC (BODY CONTROL MODULE C) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all BCMC connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the BCMC connectors. Make sure they seat and latch correctly.

    • Ignition ON.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  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 address this concern, INSTALL a new BCMC. REFER to: Body Control Module C (BCMC) .
    No  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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