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Home › Buick › 2016 › Regal GS, AWD › Repair and Diagnosis › Engine Performance › System › Data Communication System - Diagnostic Information And Procedures › Diagnostic Information and Procedures › DTC U0074: Control Module Communication (Powertrain Expansion Bus with HP6) › Circuit/System Verification

Circuit/System Verification

  1. Ignition ON/Vehicle In Service Mode.
  2. Verify that DTC P0606 is not set.
    • If DTC P0606 is not set 
  3. Refer to Circuit/System Testing.
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