U05 Factory-verified

GMC · Regular Production Option

Horn, dual-note

Years 2004–10, 2014–19, 2022–27 Models 7 Factory citations 34

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Also described as Horn, dualHorn, dual note toneHorns, dual

Also documented for Buick Cadillac Chevrolet Pontiac Saturn

Documented applications

Acadia — first generation, Lambda (2007–2017)

2007–2009, 2014–2016 Factory-verified

the 2014–2016 guides read dual-note horn.

GM factory document — 2007 gmc acadia 2wd rpo code list, p.1.
GM factory document — 2008 gmc acadia 2wd rpo code list, p.1.
GM factory document — 2009 gmc acadia 2wd rpo code list, p.1.
GM factory document — 2014 gmc acadia fleet order guide wayback, p.3.
GM factory document — 2015 gmc acadia fleet order guide wayback, p.3.
GM factory document — 2016 gmc acadia fleet order guide wayback, p.3.

Acadia — Second generation (C1XX) (2017–2023)

2017–2019 Factory-verified

2019 guide: all trims: S

GM factory document — 2017 gmc acadia order guide copy gm authority, p.5, p.22.
GM factory document — 2018 gmc acadia order guide copy gm authority, p.7, p.29.
GM factory document — 2019 gmc acadia order guide copy gm authority, p.7, p.31.

Savana — GMT610 (2003–2027)

2004–2010, 2014–2018, 2022–2027 Factory-verified

the 2025–2027 guides read Horn, dual-note high and low; O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2004 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.18.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.16.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.16.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.7.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.16.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.12.
GM factory document — 2025 gmc savana cargo fleet order guide, p.28.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.32.
GM factory document — 2025 gmc savana passenger fleet order guide, p.21.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.
GM factory document — 2026 gmc savana cargo fleet order guide, p.30.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.35.
GM factory document — 2026 gmc savana passenger fleet order guide, p.23.
GM factory document — 2027 gmc savana cargo fleet order guide, p.27.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.18.
GM factory document — 2027 gmc savana passenger fleet order guide, p.21.

Sierra EV — BT1 (2024–2027)

2027 Factory-verified

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.4.

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

all trims: S

GM factory document — 2019 gmc terrain order guide copy gm authority, p.7, p.38.

Yukon — T1XX (2021–2027)

2026 Factory-verified

GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.8.

Yukon XL — T1XX (2021–2027)

2026 Factory-verified

GM factory document — 2026 gmc yukon yukon xl electrical body builder manual service manual 2026 en us, p.8.

This page aggregates every documented appearance of U05 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.