LPO, illuminated door sill plates

Years 2015–18, 2020, 2022–27 Models 10 Factory citations 33

Also described as LPO, illuminated sill plates, frontLPO, Denali illuminated door sillsLPO, illuminated door sill plates, front doorsLPO, door sill plates, illuminated

Also documented for Buick Cadillac Chevrolet

Documented applications

Acadia — first generation, Lambda (2007–2017)

2015–2016 Factory-verified

GM factory document — 2015 gmc acadia fleet order guide wayback, p.2.
GM factory document — 2016 gmc acadia fleet order guide wayback, p.2.

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, AT4, AT4X: not offered; Denali, Denali Ultimate: O (ADI available); dealer-installed

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.34.
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)

2020, 2022–2026 Factory-verified

the upfitter lists read "Accessory, illuminated door sills"

GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.13.
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.

Terrain — First generation (2010–2017)

2016–2017 Factory-verified

SLE-1, SLE-2, SLT: dealer-installed or available

GM factory document — 2016 gmc terrain fleet order guide wayback, p.2.
GM factory document — 2017 gmc terrain fleet order guide wayback, p.2.

Yukon — K2XX (2015–2020)

2015, 2017–2018 Factory-verified

2015 marks it not available at the time; 2018: SLE, SLT: A/D, red with GMC logo; the 2018 guide prints SOM; the 2016 guide does not print it; the 2017 list prints it; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.2.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.29.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.27.

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.29.
GM factory document — 2026 gmc yukon denali fleet order guide, p.31.
GM factory document — 2027 gmc yukon fleet order guide, p.26.

Yukon XL — K2XX (2015–2020)

2015 Factory-verified

A/D on all trims, marked not yet available; not in the 2016 guide

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.2.

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.29.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.30.
GM factory document — 2027 gmc yukon xl fleet order guide, p.26.

This page aggregates every documented appearance of S0M in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.