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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Communication System - DTC U182D To U3012 And Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U1879: Drive Motor Control Module 2 Lost Communication with Engine Control Module >> Circuit/System Verification

Circuit/System Verification

  1. Vehicle in Service Mode.
  2. Verify that DTC U0100 is not set.
    • If DTC U0100 is not set 
  3. Verify that DTC U0073, U0074, U0077, U0078, U007A, P06E4, P1EB9, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1428, B1440, B1441, B1517, C0800, C0899, C12E1, P0560 or P0562 is not set.
    • If none of the DTCs are set 
  4. Refer to Circuit/System Testing.
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