Buick Encore GX 2024–2025 — technical service bulletin
Bulletin PIC6593A · NHTSA communication 11016992 · issued Apr 12, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2024–2025
model years
4
vehicle entries
Official summary
This Preliminary information communicates to the technician what to do when they encounter a service charging system message with a DTC P0621.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.