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Home >> Chevrolet >> 2021 >> Malibu LT >> Repair and Diagnosis >> Engine Mechanical >> Starter >> 12 V Starting And Charging - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC P156D >> Circuit/System Verification

Circuit/System Verification

  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no other DTCs set, except for DTC P156D.
    • Go to next step: If only DTC P156D is set 
  3. Replace the component: T19 Power Supply Transformer
  4. Verify the DTC does not set.
    • If the DTC sets - Replace the component:  K20 Engine Control Module
    • Go to next step: If the DTC does not set 
  5. All OK.
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