- 2019 Factory-verified
all trims: S
EA1 Factory-verified
Also documented for ChevroletGMC
Documented applications
- 2016 Factory-verified
2016: all groups: S
- 2016 Factory-verified
2016: all trims: S
This page aggregates every documented appearance of EA1 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.