- 2016–2019 Factory-verified
2016: 1SP; 2017–2019: 1SP, 1SH; 2019: the guide has no 4CG option row, so the year rests on 21J's requirement remark (pages 7 and 13, rule 11(b)); the 2019 color and trim page prints 4CG1 (footnote 1: not available on 1SV); the interior pages read Jet Black/Light Neutral
4CG Factory-verified
Documented applications
This page aggregates every documented appearance of 4CG in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.