Package, option 03

Years 2007–09, 2018–19, 2025–27 Models 4 Factory citations 7

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Also described as Equipment group 1SC, PreferredEquipment group 1SC, Preferred II

Also documented for Cadillac Chevrolet GMC Pontiac Saturn

Documented applications

Enclave — Lambda / GMT967 (2008–2017)

2008–2009 Factory-verified

generic wording in a list GM shared with other nameplates.

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

Envision — E2XX (2021–2027)

2025–2027 Factory-verified

column heading of the full guide; GM Authority names the same three groups

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

Regal — E2XX (2018–2020)

2018–2019 Factory-verified

only in: Sportback; models 4ZX68 FWD and 4ZG68 AWD; the 2019 page says the FWD (4ZX68) and AWD (printed 42G68) 1SC are no longer orderable as of 1-28-19

GM factory document — 2018 buick regal sportback fleet order guide wayback, p.2.
GM factory document — 2019 buick regal sportback fleet order guide wayback, p.1.

Terraza — U-body / GMT201 (2005–2007)

2007 Factory-verified

GM factory document — 2007 buick terraza rpo code list, p.1.

This page aggregates every documented appearance of 1SC in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.