Moonroof, power, panoramic, tilt-sliding

Years 2008–09, 2015–19, 2022–23, 2025–27 Models 8 Factory citations 20

Also described as Moonroof, front power sliding, transparent glass with rear fixed skylightRoof, sun, glass, sliding, electric, transparent glass fixedMoonroof, powerMoonroof, power, oversized

Also documented for Cadillac Chevrolet GMC Saturn

Documented applications

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

2018: Essence, Premium: O; Avenir: S; 2022–2023: Essence, Premium: O, included with PCJ; Avenir: S

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.4, p.22.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.4, p.21.

Enclave — Lambda / GMT967 (2008–2017)

2008–2009 Factory-verified

GM factory document — 2008 buick enclave rpo code list, p.1.
GM factory document — 2009 buick enclave rpo code list, p.1.

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

Sport Touring, Avenir: O; also named by GM Authority

GM factory document — 2025 buick encore gx fleet order guide, p.12.
GM factory document — 2026 buick encore gx fleet order guide, p.12.
GM factory document — 2027 buick encore gx fleet order guide, p.12.

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

2016–2019 Factory-verified

2019: 1SL, 1SN, 1SP: O

GM factory document — 2016 buick envision order guide copy gm authority, p.12.
GM factory document — 2017 buick envision order guide copy gm authority, p.15.
GM factory document — 2018 buick envision order guide copy gm authority, p.15.
GM factory document — 2019 buick envision order guide copy gm authority, p.16.

Envision — E2XX (2021–2027)

2025–2027 Factory-verified

2027: Preferred, Sport Touring: O; Avenir: S

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.3.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

2019: Avenir: S; Sport Touring, Essence, Premium: O; with WPB

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.2.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.14.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.3.

LaCrosse — Epsilon II, 2nd gen (2010–2016)

2015 Factory-verified

2015: 1SL, 1SP, 1SR: O; required with RLX; included with HJ4 and HJ8 interiors

GM factory document — 2015 buick lacrosse fleet order guide wayback, p.2.

Regal — E2XX (2018–2020)

2018 Factory-verified

only in: TourX

GM factory document — 2018 buick regal tourx fleet order guide wayback, p.1.

This page aggregates every documented appearance of C3U in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.