P0621 on the 2024 Buick Encore GX
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| PIC6593A | 2025-04-15. Service bulletin. This Preliminary information communicates to the technician what to do when they encounter a service charging system message with a DTC P0621. |
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| PIC6593 | 2025-02-18. Service bulletin. This Preliminary information communicates to the technician what to do when they encounter a service charging system message with a DTC P0621. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.