R8S Factory-verified

GMC · Regular Production Option

OnStar One Super Cruise extension to 8 years

Years 2026–27 Models 8 Factory citations 15

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Also described as OnStar One Super Cruise, extension to 8 years

Also documented for Buick Cadillac Chevrolet

Documented applications

Acadia — Third generation (2024–2027)

2026–2027 Factory-verified

O on all trims

GM factory document — 2026 gmc acadia fleet order guide, p.17.
GM factory document — 2027 gmc acadia fleet order guide, p.18.

Hummer EV Pickup (2022–2027)

2026 Factory-verified

GM factory document — 2026 gmc hummer ev pickup fleet order guide rpo codes, p.1.

Hummer EV SUV — BT1 (2024–2027)

2026 Factory-verified

2026: O in 3VL, 1SF, 1SG.

GM factory document — 2026 gmc hummer ev suv fleet order guide, p.18.

Sierra EV — BT1 (2024–2027)

2026–2027 Factory-verified

requires UE1 and R9M; the 2027 guide also requires UKL; 2026: A in 3SC, 4SC, 4SD, 5SB, 5SC, 5SD; not offered in 3SB; 2027: A in 3SC, 4SC, 4SD, 5SC, 5SD; not offered in 3SB

GM factory document — 2026 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra ev fleet order guide, p.18.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.16.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation 3VL: not offered; Elevation 3SB, AT4, AT4X, Denali, Denali Ultimate: O

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.30.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026)

2026 Factory-verified

GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Yukon — T1XX (2021–2027)

2026–2027 Factory-verified

2027: O on all trims

GM factory document — 2026 gmc yukon denali fleet order guide, p.26.
GM factory document — 2027 gmc yukon fleet order guide, p.23.

Yukon XL — T1XX (2021–2027)

2026–2027 Factory-verified

2027: O on all trims

GM factory document — 2026 gmc yukon xl denali fleet order guide, p.26.
GM factory document — 2027 gmc yukon xl fleet order guide, p.23.

This page aggregates every documented appearance of R8S in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.