AKO Factory-verified

Buick · Regular Production Option

Glass, deep-tinted

Years 2014, 2016–19, 2022–23, 2025–27 Models 7 Factory citations 23

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Also documented for Cadillac Chevrolet GMC

Documented applications

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

S on all trims

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.7, p.27.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.6, p.24.

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

S on all trims

GM factory document — 2025 buick all new enclave fleet order guide, p.4.
GM factory document — 2026 buick enclave fleet order guide, p.5.
GM factory document — 2027 buick enclave fleet order guide, p.5.

Encore — Gamma II (2013–2022)

2014, 2018–2019 Factory-verified

all trims: S; letter O in the code as GM prints it; GM prints no zero form

GM factory document — 2014 buick encore fleet order guide wayback, p.3.
GM factory document — 2018 buick encore order guide copy gm authority, p.5, p.20.
GM factory document — 2019 buick encore order guide copy gm authority, p.4, p.18.

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

Preferred, Sport Touring, Avenir: S

GM factory document — 2025 buick encore gx fleet order guide, p.5.
GM factory document — 2026 buick encore gx fleet order guide, p.5.
GM factory document — 2027 buick encore gx fleet order guide, p.6.

Envision — D2XX, imported from China (2016–2020)

2016–2019 Factory-verified

all trims: S; letter O in the code as GM prints it; GM prints no zero form

GM factory document — 2016 buick envision order guide copy gm authority, p.4, p.14.
GM factory document — 2017 buick envision order guide copy gm authority, p.5, p.18.
GM factory document — 2018 buick envision order guide copy gm authority, p.4, p.17.
GM factory document — 2019 buick envision order guide copy gm authority, p.5, p.20.

Envision — E2XX (2021–2027)

2025–2027 Factory-verified

2027: all trims: S; letter O in the code as GM prints it; GM prints no zero form

GM factory document — 2025 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide rpo codes, p.1.
GM factory document — 2027 buick envision fleet order guide, p.5.

Envista — VSS-F (2024–2027)

2025–2026 Factory-verified

all trims: S

GM factory document — 2025 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2025 buick envista fleet order guide, p.5.
GM factory document — 2026 buick envista fleet order guide rpo codes, p.1.
GM factory document — 2026 buick envista fleet order guide, p.5.

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