Vehicle special service, municipal

Years 2003, 2006–09, 2014, 2016, 2022–27 Models 10 Factory citations 35

Also described as Special service packageFleet special service vehicle packageSpecial Service PackageIdentifier, special service vehicle (SEO)Identifier, special service vehicle

Also documented for Cadillac GMC

Documented applications

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified

The 2009 list words it as sales package, special service, municipal.

GM factory document — 2007 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet avalanche 2wd rpo code list, p.1.

Blazer EV (2024–2027)

2025–2027 Factory-verified

only in: Police Package

GM factory document — 2025 chevrolet blazer ev police package fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet blazer ev police package fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet blazer ev police package fleet order guide rpo codes, p.1.

Bolt EV — first generation (2017–2023)

2023 Factory-verified

EUV: LT: O; Premier: not available; fleet or government order types only; includes two extra fused cabin circuits (20 A and 30 A), 5J3, A2X, driver 2-way power lumbar and AMF; not available with WPA, WPT, WPU or WGQ; the lists name it a municipal special service sales package

GM factory document — 2023 chevrolet 23 bolt ev body builder sm en us 2022aug26, p.8.
GM factory document — 2023 chevrolet 23 bolt euv body builder sm en us 2022aug29, p.8.
GM factory document — 2023 chevrolet bolt euv fleet order guide wayback, p.1.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified

identifier for the special service vehicle; the guide lists the contents

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.57.

Silverado — T1XX (2019–2026)

2022–2026 Factory-verified

GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.9.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.9.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.10.
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 — GMT900 (2007–2014)

2007–2009 Factory-verified

The 2009 list words it as sales package, special service, municipal.

GM factory document — 2007 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.36.

Tahoe — GMT800 (2000–2006)

2003, 2006 Factory-verified internal

the order guides print it as "Identifier, Special Service Vehicle", used to identify a police/fire special service vehicle for marketing, order-build process and certification purposes; it must be specified

GM Heritage factory kit — 2003 Chevrolet Tahoe, p.157.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.177.

Tahoe — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

The 2009 list words it as sales package, special service, municipal. The 2014 Special Service guide words it as the identifier for a special service vehicle and requires it.

GM factory document — 2007 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet tahoe special service vehicle fleet order guide wayback, p.2.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.31, p.194.

Tahoe — K2XX (2015–2020)

2016 Factory-verified

only in: Special Service; the lists read sales package, special service; the 2017 shared list also prints it, but no Tahoe page of 2017 or later in the sources does, so 2017 is not claimed

GM factory document — 2016 chevrolet tahoe special service vehicle fleet order guide wayback, p.2.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.3.

Tahoe — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: Special Service: O; includes K47, KX4, K6K, RC1, 5J3, UT7, V53, ATD, NP0; printed by the Tahoe police package and special service guides, not by the retail and fleet guides; the 2022 and 2023 body-builder lists read sales package, special service, municipal; the 2026 body-builder list shows the code over its content lines

GM factory document — 2025 chevrolet new tahoe police package and special service fleet order guide, p.12.
GM factory document — 2026 chevrolet tahoe police package and special service fleet order guide, p.12.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.12.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.9.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.9.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.4.

This page aggregates every documented appearance of 5W4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.