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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P156D >> Circuit/System Testing

Circuit/System Testing

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  1. Verify that no other DTCs are set except for DTC P156D.
    • Go to next step: 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.

    • Go to next step: If DTC does not set 
  4. All OK.
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