- 2019 Factory-verified
new for 2019, not at start of production; premium paint; Black Carbon Metallic lower accent; GM Authority's 2021 changes page says it was dropped for 2021
GUM Factory-verified
Also documented for Chevrolet
Documented applications
This page aggregates every documented appearance of GUM in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.