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Home >> Cadillac >> 2017 >> CT6 Base, 2.0L Eng VIN X >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - DTC B1000 To DTC U1818 >> Diagnostic Information and Procedures >> DTC U007B: Control Module Communication High Speed Extension CAN Bus Off >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON/Vehicle In Service Mode.
  2. Verify that DTC U0073, U0074, U0075, 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 
  3. Refer to Circuit/System Testing.
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