U05 Factory-verified

Buick · Regular Production Option

Horn, dual-note

Years 1987, 2004–06, 2008–09, 2014, 2016–19, 2022–23, 2025–27 Models 7 Factory citations 17

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

Also documented for Cadillac Chevrolet GMC Pontiac Saturn

Documented applications

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

S on all trims

GM factory document — 2018 buick enclave fleet order guide wayback, p.1.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.7, p.27.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.7, p.24.

Enclave — Lambda / GMT967 (2008–2017)

2008–2009 Factory-verified

GM factory document — 2008 buick enclave rpo code list, p.1.
GM factory document — 2009 buick enclave rpo code list, p.1.

Encore — Gamma II (2013–2022)

2014, 2018–2019 Factory-verified

all trims: S

GM factory document — 2014 buick encore fleet order guide wayback, p.2.
GM factory document — 2018 buick encore order guide copy gm authority, p.2, p.16.
GM factory document — 2019 buick encore order guide copy gm authority, p.2, p.14.

Encore GX — VSS-F (2020–2027)

2025–2027 Factory-verified

Preferred, Sport Touring, Avenir: S

GM factory document — 2025 buick encore gx fleet order guide, p.3.
GM factory document — 2026 buick encore gx fleet order guide, p.3.
GM factory document — 2027 buick encore gx fleet order guide, p.3.

Envision — D2XX, imported from China (2016–2020)

2016–2019 Factory-verified

all trims: S

GM factory document — 2016 buick envision order guide copy gm authority, p.4, p.14.
GM factory document — 2017 buick envision order guide copy gm authority, p.5, p.18.
GM factory document — 2018 buick envision order guide copy gm authority, p.5, p.17.
GM factory document — 2019 buick envision order guide copy gm authority, p.5, p.20.

Regal — G-body (1983–1987)

1987 Confirmed

standard; gnttype.org's 1987 option sheet

Rendezvous — U-body / GMT257 (2002–2007)

2004–2006 Factory-verified

GM factory document — 2004 buick rendezvous awd rpo code list, p.1.
GM factory document — 2006 buick rendezvous awd rpo code list, p.1.

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