- 2023–2027 Factory-verified
2025: AT4: O; Elevation, Denali: not offered; 2026–2027: AT4X: S; Elevation, AT4, Denali: not offered
3F9 Factory-verified
Also documented for Chevrolet
Documented applications
This page aggregates every documented appearance of 3F9 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.