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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (12 V Starting And Charging - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0621 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition OFF for greater than 5 s.
  2. Engine running.
  3. Verify DTC P0621 is not set as current.
    • If DTC P0621 is set as current 

      Refer to Circuit/System Testing.

    • Go to next step: If DTC P0621 is not set or is set as history 
  4. A fault is currently not present and may be an intermittent condition. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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