Back-up alarm, 97 decibels

Years 2001–03, 2005–07, 2015, 2020, 2023, 2025–27 Models 11 Factory citations 34

Also described as Alarm, backup, electrical, 97 decibels (SEO)Back-up alarm, electrical, 97 decibelsBack-up alarm, 97 dB (SEO)Backup alarm, 97 decibelsAlarm, back-up, electrical, 97 decibels (SEO)

Also documented for GMC

Documented applications

Colorado — Third generation (2023–2027)

2025–2027 Factory-verified

special equipment option (SEO); not available with SFW; WT: O; LT, Trail Boss, Z71, ZR2: not offered

GM factory document — 2025 chevrolet colorado fleet order guide, p.55.
GM factory document — 2026 chevrolet colorado fleet order guide, p.62.
GM factory document — 2027 chevrolet colorado fleet order guide, p.60.

Express — GMT600 (1996–2002)

2001–2002 Factory-verified

GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Express — GMT610 (2003–2027)

2023, 2025–2027 Factory-verified

O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.37.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.50.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.29.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.39.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.52.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.32.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.37.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.26.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.29.

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.

Silverado — GMT800 (1999–2007)

2001, 2005–2007 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado, p.60.
GM Heritage factory kit — 2005 Chevrolet Silverado 1500, p.196.
GM Heritage factory kit — 2006 Chevrolet Silverado, p.261.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.276.

Silverado HD — GMT800 (2001–2007)

2001–2003, 2005 Factory-verified

years from Heritage kit pages, not in GM’s service list of that year: 2002 (kit list); 2003 (order guide); 2005 (order guide)

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.45.
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.297.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.208.

Silverado HD (T1XX, 2020–2027)

2025–2027 Factory-verified

only in: 2500 HD, 3500 HD, 3500 HD chassis cab

GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Silverado — K2XX (2014–2019)

2015 Factory-verified

GM factory document — 2015 chevrolet silverado 1500 fleet order guide wayback, p.1.

Silverado — T1XX (2019–2026)

2020, 2025–2026 Factory-verified

GM factory document — 2020 chevrolet silverado 1500 fleet order guide wayback, p.1.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

Suburban — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.

Tahoe — GMT800 (2000–2006)

2001 Factory-verified

GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.

This page aggregates every documented appearance of 8S3 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.