- 2025–2027 Factory-verified
2025: AT4: S; Elevation, Denali: not offered; 2026–2027: AT4: S; Elevation, Denali, Denali Ultimate: not offered
G99 Factory-verified
Also documented for BuickCadillacChevrolet
Documented applications
This page aggregates every documented appearance of G99 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.