S1O Factory-verified

GMC · Regular Production Option

LPO, console-mounted safe

Years 2019–20, 2022–27 Models 8 Factory citations 31

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Also described as LPO, lockable storage containerLPO, console-mounted safe, dealer-installed

Also documented for Cadillac Chevrolet

Documented applications

Hummer EV Pickup (2022–2027)

2025–2026 Factory-verified

the 2025 list prints "LPO Container-Lockable Storage"

GM factory document — 2025 gmc hummer ev pickup fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc hummer ev pickup fleet order guide rpo codes, p.1.

Hummer EV SUV — BT1 (2024–2027)

2025–2026 Factory-verified

the 2026 guide prints "Lockable storage container". GM prints a letter O here; no zero form exists in GM lists. 2025: O in 1SF, 1SG; 2026: O in 1SF, 1SG; not offered in 3VL.

GM factory document — 2025 gmc hummer ev suv fleet order guide, p.16.
GM factory document — 2026 gmc hummer ev suv fleet order guide, p.20.

Sierra EV — BT1 (2024–2027)

2026–2027 Factory-verified

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.19.
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.17.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro, Elevation 3VL: not offered; Elevation 3SB, AT4, AT4X, Denali, Denali Ultimate: O (ADI available); dealer-installed

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.34.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

only in: 2500 HD and 3500 HD pickup

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

the upfitter lists read "Accessory, container, lockable storage, interior"

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.13.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.14.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.13.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.13.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.15.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.13.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Yukon — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: Elevation, AT4, Denali: O

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.12.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.12.
GM factory document — 2025 gmc new yukon denali fleet order guide, p.29.
GM factory document — 2026 gmc yukon denali fleet order guide, p.31.
GM factory document — 2027 gmc yukon fleet order guide, p.26.

Yukon XL — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: Elevation, AT4, Denali: O

GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.12.
GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.12.
GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.29.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.30.
GM factory document — 2027 gmc yukon xl fleet order guide, p.26.

This page aggregates every documented appearance of S1O in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.