- 2023–2027 Factory-verified
2025: S on all trims; 2026–2027: Elevation, AT4, Denali: S; AT4X: not offered; the 2024 guide adds widened track
Z2I Factory-verified
Also documented for Chevrolet
Documented applications
This page aggregates every documented appearance of Z2I in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.