BUICK, CHEVROLET

PIC6593A

2025-04-12 · NHTSA 11016992

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

Manufacturer summary

Original wording in English

This Preliminary information communicates to the technician what to do when they encounter a service charging system message with a DTC P0621.

Repeated filings are grouped only when make, bulletin number, publication date and complete summary agree. Original record numbers are retained. Older publications remain available, and an explicit later version is shown when established. Pre-1994 vehicle associations are separated from default results; an unspecified year does not mean all model years apply.