T3U Factory-verified

GMC · Regular Production Option

Fog lamps

Years 2014–27 Models 11 Factory citations 44

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Also described as Fog lamps, frontFog lamps, LED, front and rearFog lamps, LEDFog lamps, front, halogenFog lamps, front, LED

Also documented for Buick Cadillac Chevrolet

Documented applications

Canyon — Second generation (GMT31XX) (2015–2022)

2015–2017, 2019, 2021–2022 Factory-verified

2015–2016: SLE, SLT: S; SL, Canyon: not offered; 2021: Elevation, AT4, Denali: S; Elevation Standard: not offered; the 2021 guide reads LED

GM factory document — 2015 gmc canyon fleet order guide wayback, p.6.
GM factory document — 2016 gmc canyon fleet order guide wayback, p.6.
GM factory document — 2017 chevrolet canyon colorado electrical body builders manual service manual 2017 en us, p.17.
GM factory document — 2019 chevrolet 19 coloradocanyon body builder sm u 2018aug01 1, p.12.
GM factory document — 2021 gmc canyon fleet order guide wayback, p.1.
GM factory document — 2022 chevrolet 22 canyon colorado electrical body builder sm en us 2021oct15, p.13.

Sierra EV — BT1 (2024–2027)

2025–2027 Factory-verified

2025: S in 5SC, 5SD; 2026: S in 5SB, 5SC, 5SD; not offered in 3SB, 3SC, 4SC, 4SD; 2027: S in 5SC, 5SD; not offered in 3SB, 3SC, 4SC, 4SD

GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra ev denali fleet order guide, p.4.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.8.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro: not offered; AT4, Elevation, AT4X, Denali, Denali Ultimate: included in the trim group

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.18.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified

2018: GM's 2018 Sierra 2500HD order guide; 2019: named in the 2019 interior page's package contents or footnotes

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.3.
GM factory document — 2019 gmc sierra 2500hd fleet order guide wayback, p.1.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.7.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

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 — K2XX (2014–2019)

2014, 2016–2019 Factory-verified

halogen in 2014; thin-profile LED, new, in 2016.

GM factory document — 2014 gmc sierra 1500 fleet order guide wayback, p.3.
GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.3.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.32.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.91.
GM factory document — 2019 gmc sierra 1500 limited double cab k2xx order guide copy gm authority, p.41.

Sierra — T1XX (2019–2026)

2019–2020, 2022–2026 Factory-verified

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.13.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.14.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.14.
GM factory document — 2023 gmc 23 sierra 1500 electrical body builder sm en us 2022oct12, p.14.
GM factory document — 2024 gmc 24 sierra 1500 sm electrical body builder esid 23dec12, p.16.
GM factory document — 2025 gmc my25 sierra 1500 electrical bbm, p.14.
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 — Second generation (D2XX) (2018–2024)

2019 Factory-verified

SLT, SLT Diesel, Denali: S

GM factory document — 2019 gmc terrain order guide copy gm authority, p.6, p.37.

Terrain — Third generation (2025–2027)

2025–2027 Factory-verified

S: AT4 (from 2026), Denali (from 2026); O: Elevation; included in, and only available with, CWN

GM factory document — 2025 gmc next generation terrain fleet order guide, p.16.
GM factory document — 2026 gmc next generation terrain fleet order guide, p.5.
GM factory document — 2027 gmc terrain fleet order guide, p.6.

Yukon — K2XX (2015–2020)

2015–2019 Factory-verified

S on all trims; 2018–2019 read with chrome surround; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.3.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.3.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.32.
GM factory document — 2019 gmc yukon denali fleet order guide wayback, p.1.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.3.

Yukon XL — K2XX (2015–2020)

2015–2017 Factory-verified

S on all trims

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.3, p.5.
GM factory document — 2016 gmc yukon xl denali fleet order guide wayback, p.3, p.5.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.14.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.32.

This page aggregates every documented appearance of T3U in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.