1SU ✓ Factory-verified

Buick · Regular Production Option

Equipment group 1SU, Avenir

Years 2018–19, 2025–27 Models 3 Factory citations 4

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Also documented for ChevroletGMC

Documented applications

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.

LaCrosse — E2XX, 3rd gen (2017–2019) →

• 2018–2019 ✓ Factory-verified

  the NICB 2018 manual lists the Avenir series; 2018: GM Authority

  ⛭ GM factory document — 2019 buick lacrosse order guide copy gm authority, p.1.

Regal — E2XX (2018–2020) →

• 2019 ✓ Factory-verified

  only in: Sportback; model 4ZY68 FWD

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

Related codes · mentioned in these notes

FWD

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