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Home >> Buick >> 2017 >> Envision Preferred, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U18A7: Lost Communication with Power Supply Transformer on Powertrain Expansion CAN Bus >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify that DTC U0073, U0074, 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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