- 2023–2027 Factory-verified
2025: O on all trims; 2026–2027: AT4X: S; Elevation, AT4, Denali: O
CAC Factory-verified
Also documented for BuickChevrolet
Documented applications
This page aggregates every documented appearance of CAC in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.