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Pinpoint Test An: DTC U0140 - Lost Communication With Body Control Module (Gem)

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. AN1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER (IC) SELF-TESTS 
    • Check for recorded instrument cluster (IC) DTCs from the continuous and on-demand self-tests.
    • Is DTC B1318 recorded? 
    1. YES  : REFER to Go to Pinpoint Test AG .
    2. NO  : Go to  AN2.
  2. AN2 RECHECK THE INSTRUMENT CLUSTER (IC) DTCs 
    • Clear the DTCs.
    • Repeat the instrument cluster (IC) self-test.
    • Is DTC U0140 still present? 
    1. YES  : Go to  AN3.
    2. NO  : The system is operating correctly at this time. The DTC may have been set due to high network traffic.
  3. AN3 CHECK THE AUDIO CONTROL MODULE (ACM) AND HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE FOR DTC U0140 
    • Carry out the self-test on the ACM and HVAC.
    • Is DTC U0140 recorded? 
    1. YES  : REFER to MODULE COMMUNICATIONS NETWORK article to diagnose no communication with the SJB.
    2. NO  : Go to  AN4.
  4. AN4 CHECK FOR CORRECT INSTRUMENT CLUSTER (IC) OPERATION 
    • Disconnect the instrument cluster (IC) connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster (IC) connector and make sure it seats correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster (IC). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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