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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis >> Electrical >> Body Electrical >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P156D: DC/DC Converter Ignition Switch Run/Start Position Signal Message Counter Incorrect >> Circuit/System Testing
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Circuit/System Testing

  1. Verify that no other DTCs are set except for DTC P156D.
    • If only DTC P156D is set 
  2. Replace the T19 Power Supply Transformer.
  3. Verify the DTC does not set while operating the vehicle within the Conditions for Running the DTC.
    • If DTC sets 

      Replace the K20 Engine Control Module.

    • If DTC does not set 
  4. All OK.
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