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Home >> Cadillac >> 2018 >> CT6 Plug-In >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Battery, Charging System And Starting System (Except Hybrid)) >> Diagnostic Information and Procedures >> DTC P0621 >> Circuit/System Verification

Circuit/System Verification

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  1. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  2. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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