S3I ✓ Factory-verified

GMC · Regular Production Option

LPO, GMC illuminated puddle lamp emblem

Years 2022–27 Models 6 Factory citations 24

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Also described as LPO, illuminated perimeter rocker lightingLPO, illuminated mirror GMC emblem

Also documented for BuickCadillacChevrolet

Documented applications

Acadia — Third generation (2024–2027) →

• 2025–2027 ✓ Factory-verified

  O on all trims

  ⛭ GM factory document — 2025 gmc acadia fleet order guide, p.19.

  ⛭ GM factory document — 2026 gmc acadia fleet order guide, p.19.

  ⛭ GM factory document — 2027 gmc acadia fleet order guide, p.20.

Sierra 1500 — Next-Generation (2027) →

• 2027 ✓ Factory-verified

  Pro, Elevation: not offered; AT4, Denali: O (ADI available); AT4X, Denali Ultimate: included in the trim group; dealer-installed

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.22.

  ⛭ GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — T1XX (2020–2027) →

• 2025–2027 ✓ Factory-verified

  only in: 2500 HD and 3500 HD pickup

  ⛭ GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Sierra — T1XX (2019–2026) →

• 2022–2026 ✓ Factory-verified

  the upfitter lists read "Accessory, lamps, perimeter illumination"

  ⛭ GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.13.

  ⛭ GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.13.

  ⛭ GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.15.

  ⛭ GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.13.

  ⛭ GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Yukon — T1XX (2021–2027) →

• 2022–2023, 2025–2027 ✓ Factory-verified

  2027: O on all trims

  ⛭ GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.12.

  ⛭ GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.12.

  ⛭ GM factory document — 2025 gmc new yukon denali fleet order guide, p.66.

  ⛭ GM factory document — 2026 gmc yukon denali fleet order guide, p.71.

  ⛭ GM factory document — 2027 gmc yukon fleet order guide, p.62.

Yukon XL — T1XX (2021–2027) →

• 2022–2023, 2025–2027 ✓ Factory-verified

  2027: O on all trims

  ⛭ GM factory document — 2022 gmc 22 yukon yukon xl electrical body builder sm u 2021oct13, p.12.

  ⛭ GM factory document — 2023 gmc 23 yukon yukon xl electrical body builder sm en us 092822, p.12.

  ⛭ GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.69.

  ⛭ GM factory document — 2026 gmc yukon xl denali fleet order guide, p.71.

  ⛭ GM factory document — 2027 gmc yukon xl fleet order guide, p.62.

This page aggregates every documented appearance of S3I in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.