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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P155E, P155F, or P156E: DC/DC Converter >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON.
  2. Verify that no other DTCs are set except for DTC P155E, DTC P155F, or DTC P156E
    • If no other DTCs are set 
  3. Replace the T19 Power Supply Transformer.
  4. Verify DTC P155E, DTC P155F, or DTC P156E does not set while operating the vehicle within the conditions for running the DTC.
    • If any of the DTCs are set 

      Replace the K20 Engine Control Module.

    • If none of the DTCs are set 
  5. All OK
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