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