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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1818 >> Diagnostic Information and Procedures >> DTC U1817: Lost Communication with Hybrid Powertrain Control Module on Powertrain Expansion CAN Bus >> Circuit/System Verification

Circuit/System Verification

  1. Vehicle in Service Mode.
  2. Verify that DTC U0293 is not set.
    • If DTC U0293 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. Verify that DTCs U1818, U1821 and U182D are not set.
    • If all of the DTCs are set together 

      Refer to DTC U0074 .

    • If all of the DTCs are not set together 
  5. Refer to Circuit/System Testing.
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