1SX ✓ Factory-verified

Buick · Regular Production Option

Equipment group 1SX, GS

Years 2014, 2016, 2018–19 Models 2 Factory citations 3

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Also documented for ChevroletGMC

Documented applications

Regal — E2XX (2018–2020) →

• 2018–2019 ✓ Factory-verified

  only in: Sportback; model 4ZZ68 AWD

  ⛭ 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.

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

• 2014, 2016 ✓ Factory-verified

  new model code lineup; UVD and MDE standard (GM's 2014 list); GS

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

Related codes · mentioned in these notes

MDEUVD

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