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Pinpoint Test L: DTC U0155

  1. Refer to MODULE COMMUNICATIONS NETWORK for schematic and connector information.

    Normal Operation and Fault Conditions 

    The IPC, GSM and BCM use information contained in messages on the HS-CAN.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    GSM U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub Type Information This DTC sets if the GSM does not receive some or all of an expected message from the IPC.

    Possible Sources 

    • Communication concern
    • GSM
    • IPC

  2. L1 VERIFY THE SCAN TOOL COMMUNICATES WITH THE IPC (INSTRUMENT PANEL CLUSTER)

    • Using a diagnostic scan tool, carry out the IPC self-test.

    Did the IPC complete the self-test? 

    Yes  GO to  L2
    No  To diagnose the IPC does not respond to the scan tool, REFER to: Controller Area Network (CAN) Module Communications Network . REFER to: Controller Area Network (CAN) Module Communications Network - System Operation and Component Description .

  3. L2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Check for DTCs from the self-test.

    Are any non-network diagnostic trouble codes (DTCs) present? 

    Yes  Diagnose those diagnostic trouble codes (DTCs) first. REFER to: Instrumentation, Message Center and Warning Chimes . REFER to: Instrumentation, Message Center and Warning Chimes - Vehicles With: Head Up Display (HUD) .
    No  GO to  L3

  4. L3 CHECK THE GSM (GEAR SHIFT MODULE) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: If a GSM self-test is carried out, the driver door must be fully closed and locked. A false P166B DTC may set if the driver door is not fully closed and locked.

    • Using the diagnostic scan tool, carry out the GSM self-test.

    Are any non-network diagnostic trouble codes (DTCs) present? 

    Yes  RESOLVE those diagnostic trouble codes (DTCs) first. REFER to Diagnostic Trouble Code (DTC) Chart  .
    No  GO to  L4

  5. L4 CHECK THE GWM (GATEWAY MODULE A) FOR DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, carry out the GWM self-test.

    Are any diagnostic trouble codes (DTCs) present? 

    Yes  REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  L5

  6. L5 RECHECK THE GSM (GEAR SHIFT MODULE) DIAGNOSTIC TROUBLE CODES (DTCS)

    NOTE: If a GSM self-test is carried out, the driver door must be fully closed and locked. A false P166B DTC may set if the driver door is not fully closed and locked.

    • Using a diagnostic scan tool, clear the GSM diagnostic trouble codes (DTCs).

    • Road test the vehicle.

    • Using a diagnostic scan tool, carry out the GSM self-test.

    Is DTC U0155 still present? 

    Yes  GO to  L6
    No  The system is operating correctly at this time. The DTC may have set due to high network traffic or an intermittent fault condition.

  7. L6 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U0155 SET IN OTHER MODULES

    • Using the diagnostic scan tool, perform the self-test for all modules.

    • Retrieve the diagnostic trouble codes (DTCs) from all modules.

    Is DTC U0155 present in other modules? 

    Yes  GO to  L7
    No  GO to  L9

  8. L7 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERNS

    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 GSM. If recent service history is found:

      • verify correct replacement module was installed

        • HVBOM may be used to verify correct part application

      • 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 customer vehicle

        • return the swapped module to source vehicle and obtain new replacement module

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

    Is the concern still present? 

    Yes  GO to  L8
    No  The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

  9. L8 CHECK FOR CORRECT IPC (INSTRUMENT PANEL CLUSTER) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the IPC and all related in-line 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

    • Reconnect the IPC and all related in-line connectors. Make sure they seat and latch correctly.

    • 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 (general service bulletin), SSM (special service message) or FSA (Field Service Action). 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 IPC. REFER to: Instrument Panel Cluster (IPC) .
    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.

  10. L9 CHECK FOR CORRECT GSM (GEAR SHIFT MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect GSM C2532 and all related in-line electrical 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

    • Reconnect GSM C2532 and all related in-line electrical connectors. Make sure they seat and latch correctly.

    • Using the diagnostic scan tool, clear all diagnostic trouble codes (DTCs).

    • Carry out the GSM self-test.

    Is DTC U0155 still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB (general service bulletin), SSM (special service message) or FSA (Field Service Action). 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 GSM. REFER to: Gear Shift Module (GSM) .
    No  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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