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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P156D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.
  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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