Equipment group 1SN, Premium

Years 2012–14, 2016–24 Models 5 Factory citations 11

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Also described as Trim group, Enclave PremiumEquipment group 1SN, Premium IEquipment group 1SN

Also documented for Cadillac Chevrolet GMC

Documented applications

Enclave — C1XX (2018–2024)

2018–2024 Factory-verified

Premium (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.

Encore — Gamma II (2013–2022)

2013–2014, 2018 Factory-verified

2013–2014: Premium (NICB: Premium Group); 2018: Premium; not in the 2019 guide

GM factory document — 2013 buick encore fleet order guide wayback, p.1.
GM factory document — 2014 buick encore fleet order guide wayback, p.2.
GM factory document — 2018 buick encore order guide copy gm authority, p.1.

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

2016–2020 Factory-verified

only in: all-wheel drive (4XT26); the 2016 and 2017 guides call it Premium I; 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 — Epsilon II, 2nd gen (2010–2016)

2012 Confirmed

FWD and AWD; replaced the CXL with PCM for 2012 (GM Authority 2012 RPO list); deleted for 2013, its content moved to 1SL (GM Authority 2013 changes)

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

2012, 2014, 2016 Factory-verified

new for 2012, replacing the 2011 RL3, RL4, T01 and T02 groups (GM's 2012 list); new model code lineup; LUK on 1SN only (GM's 2014 list); Premium I; requires a fleet or government order type; the column headings print 1SN2 (footnote 2), the color and trim page the bare code

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

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