U05 Factory-verified

Chevrolet · Regular Production Option

Horn, dual-note

Years 1963–86, 1988, 1993, 1996, 2004–10, 2014–19, 2022–27 Models 23 Factory citations 72

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Also described as Dual hornsDual HornDual HornsDual hornHorns, dualHorn, dualDual-note horns

Also documented for Buick Cadillac GMC Pontiac Saturn

Documented applications

Camaro

1970–1981 Factory-verified

GM Heritage factory kit — 1973 Chevrolet Camaro, p.121.
GM Heritage factory kit — 1981 Chevrolet Camaro, p.39.

Chevelle / El Camino

1969 Factory-verified

GM Heritage factory kit — 1969 Chevrolet El Camino, p.6.

Corvette (C3)

1974 Factory-verified

$4.00; 5,258 built

GM Heritage factory kit — 1974 Chevrolet Corvette, p.30.
1975 Confirmed

$4.00; 22,011 built

Impala / Full-Size

1963–70s (varies) Confirmed

Nova / Chevy II

1968–1969, 1973–1979 Factory-verified

GM Heritage factory kit — 1968 Chevrolet Nova Coupe, p.9.
GM Heritage factory kit — 1979 Chevrolet Nova, p.56.

Beretta — L-body (1987–1996)

1996 Factory-verified

the 1994–1995 option-weight pages print UOS

GM Heritage factory kit — 1996 Chevrolet Beretta, p.55.

Blazer — C1XX (2019–2026)

2025–2026 Factory-verified

2LT, 3LT, RS: S; Premier: S (2025 only)

GM factory document — 2025 chevrolet blazer fleet order guide rpo codes, p.1.
GM factory document — 2025 chevrolet blazer fleet order guide, p.6.
GM factory document — 2026 chevrolet blazer fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet blazer fleet order guide, p.5.

Bolt EV — first generation (2017–2023)

2023 Factory-verified

GM factory document — 2023 chevrolet 23 bolt ev body builder sm en us 2022aug26, p.10.
GM factory document — 2023 chevrolet 23 bolt euv body builder sm en us 2022aug29, p.11.

BrightDrop (2022–2026)

2025–2026 Factory-verified

S;

GM factory document — 2025 chevrolet brightdrop 400 and brightdrop 600 fleet order guide, p.4.
GM factory document — 2026 chevrolet brightdrop 400 and brightdrop 600 fleet order guide, p.4.

Camaro — Gen 3 (1982–1992)

1982–1986 Factory-verified

several pages print UO5 (letter O)

GM Heritage factory kit — 1982 Chevrolet Camaro, p.35.
GM Heritage factory kit — 1983 Chevrolet Camaro, p.26.
GM Heritage factory kit — 1984 Chevrolet Camaro, p.4.
GM Heritage factory kit — 1985 Chevrolet Camaro, p.22.
GM Heritage factory kit — 1986 Chevrolet Camaro, p.22.

Cavalier — third generation (1995–2005)

2004 Factory-verified

GM factory document — 2004 chevrolet cavalier rpo code list, p.1.
GM Heritage factory kit — 2004 Chevrolet Cavalier, p.21.

Celebrity — A-body (1982–1990)

1984–1986 Factory-verified

GM Heritage factory kit — 1984 Chevrolet Celebrity, p.42.
GM Heritage factory kit — 1985 Chevrolet Celebrity, p.44.
GM Heritage factory kit — 1986 Chevrolet Celebrity, p.43.

Citation — X-body (1983–1985)

1984 Factory-verified

1985: the OCR text prints V05 (its page image reads U05), so 1985 is not claimed here

GM Heritage factory kit — 1984 Chevrolet Citation, p.35.

Corsica — L-body (1987–1996)

1988, 1993 Factory-verified

dual note horns; the 1993 page prints UO5; the 1989 page prints 005 and the 1991–1992 pages UOS, so those years are not claimed; 1994–1996 are not claimed: the option-weight pages still list it, but the 1994–1996 order guides do not offer it; same description as beretta-gen1; 1990 not claimed: the order guide lists dual horns only inside LTZ base group LZAB's contents (owner ruling 2026-10-29)

GM Heritage factory kit — 1988 Chevrolet Corsica, p.32.
GM Heritage factory kit — 1993 Chevrolet Corsica, p.40.

Equinox EV — Ultium BEV2 (2024–2027)

2025–2027 Factory-verified

GM factory document — 2025 chevrolet new 25my equinox ev fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet equinox ev fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet equinox ev fleet order guide rpo codes, p.1.
GM factory document — 2025 chevrolet new 25my equinox ev fleet order guide, p.27.
GM factory document — 2026 chevrolet equinox ev fleet order guide, p.5.
GM factory document — 2027 chevrolet equinox ev fleet order guide, p.5.

Equinox — Third generation (D2XX) (2018–2024)

2018 Factory-verified

L, LS, LT, Premier: S

GM factory document — 2018 chevrolet all new equinox fleet order guide wayback, p.1.
2019 Factory-verified

1SM, 1LS, 2FL, 1LT, 2LT, 3LT, 1LZ, 2LZ, 3LZ: S

GM factory document — 2019 chevrolet equinox order guide april 6 2018 copy gm authority, p.119.

Express — 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 chevrolet express rpo code list, p.1.
GM factory document — 2005 chevrolet express awd rpo code list, p.1.
GM factory document — 2006 chevrolet express awd rpo code list, p.1.
GM factory document — 2007 chevrolet express awd rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
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 — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.16.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.10.
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 — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.15.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.12.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.13.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.18.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.10.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.13.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.19.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.11.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.13.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.9.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.10.

Malibu — fourth generation, A-body (1983)

1983 Factory-verified

GM Heritage factory kit — 1983 Chevrolet Malibu, p.21.
GM Heritage factory kit — 1983 Chevrolet Malibu, p.23.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet next generation silverado 1500 retail and fleet fleet order guide, p.9.

Suburban — T1XX (2021–2027)

2026 Factory-verified

GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.9.

Tahoe — T1XX (2021–2027)

2026 Factory-verified

GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.9.

Traverse — First generation (2009–2017)

2009, 2015 Factory-verified

the 2015 guide reads dual-note horn.

GM factory document — 2009 chevrolet traverse rpo code list, p.1.
GM factory document — 2015 chevrolet traverse fleet order guide wayback, p.2.

Traverse — C1XX (2018–2024)

2018–2019 Factory-verified

S on all trims

GM factory document — 2018 chevrolet traverse order guide copy gm authority, p.15, p.51.
GM factory document — 2019 chevrolet traverse order guide copy gm authority, p.17, p.73.
2024 Single-source

decoderpo.com's 2024 Traverse Limited order guide page lists it on its Standart Equipment tab (1LS); the page is a T3 mirror of GM's guide and the repository holds no GM document for 2024

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