Equipment group 1SP, Premium I

Years 2012–27 Models 7 Factory citations 19

Also described as Trim group, Cascada PremiumTrim group, Enclave AvenirEquipment group 1SP, Premium IIEquipment group 1SP, PremiumEquipment group 1SP

Also documented for Cadillac Chevrolet GMC

Documented applications

Cascada — Delta II (2016–2019)

2016–2019 Factory-verified

column heading of every guide ("Premium 1SP"); the NICB manuals print a Premium Group series (WH) 2017–2019

GM factory document — 2016 buick cascada order guide copy gm authority, p.1.
GM factory document — 2017 buick cascada order guide copy gm authority, p.1.
GM factory document — 2018 buick cascada order guide copy gm authority, p.1.
GM factory document — 2019 buick cascada order guide copy gm authority, p.1.

Enclave — C1XX (2018–2024)

2018–2024 Factory-verified

Avenir (FWD and AWD): S; shown in the guides' trim headings; 2019–2021, 2024: GM Authority

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.1, p.2, p.3.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.1, p.2, p.3.

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

Avenir: S; GM fleet model 4LE56; shown in the trim headings of the guides; GM Authority gives 1SP (4LE56) for the 2026 Avenir; NICB prints the series as Avenir

GM factory document — 2025 buick all new enclave fleet order guide, p.1.
GM factory document — 2026 buick enclave fleet order guide, p.1.
GM factory document — 2027 buick enclave fleet order guide, p.1.

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

2016–2020 Factory-verified

only in: all-wheel drive (4XU26); 2020: GM Authority's Espresso Metallic article

GM factory document — 2016 buick envision order guide copy gm authority, p.1.
GM factory document — 2017 buick envision order guide copy gm authority, p.1.
GM factory document — 2018 buick envision order guide copy gm authority, p.1.
GM factory document — 2019 buick envision order guide copy gm authority, p.1.

LaCrosse — E2XX, 3rd gen (2017–2019)

2017–2019 Factory-verified

FWD and AWD

GM factory document — 2017 buick lacrosse fleet order guide wayback, p.1.
GM factory document — 2018 buick lacrosse order guide copy gm authority, p.1.
GM factory document — 2019 buick lacrosse order guide copy gm authority, p.1.

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

2012, 2015–2016 Factory-verified

FWD and AWD; replaced the CXL with PCM and PCK for 2012 (GM Authority 2012 RPO list); 2016: GM Authority 2016 changes

GM factory document — 2015 buick lacrosse fleet order guide wayback, p.1, p.2.
2013 Single-source

named Premium II until GM renamed it Premium I for 2013 (GM Authority 2013 changes); single-source for 2013: GM Authority 2013 changes does not credit GM

Regal — Epsilon II, 5th gen (2011–2017)

2012, 2014, 2016 Factory-verified

new for 2012, replacing the 2011 RL5, RL6, T03 and T04 groups (GM's 2012 list); new model code lineup (GM's 2014 list); Premium II

GM factory document — 2016 buick regal order guide copy gm authority, p.1, p.27.

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