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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 347 (Battery, Starting System And Charging System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P155E, P155F, or P156E >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify that no other DTCs are set except for DTC P155E, DTC P155F, or DTC P156E
    • Go to next step: If no other DTCs are set 
  3. Replace the T19 Multifunction Power Supply Converter.
  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.

    • Go to next step: If none of the DTCs are set 
  5. A fault is not currently present and may be an intermittent condition.
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