Calibration, taillamp flasher, Red/Red (SEO)

Years 2023–27 Models 4 Factory citations 11

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Also described as Calibration, taillamp flasher, Red/Red

Documented applications

Blazer EV (2024–2027)

2025–2027 Factory-verified internal

; 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.

Silverado 1500 — Fifth generation (2027)

2027 Factory-verified internal

; the list prints 5LO with a letter O

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

Silverado — T1XX (2019–2026)

2023–2026 Factory-verified internal

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.

Tahoe — T1XX (2021–2027)

2025–2027 Factory-verified internal

2027: police guides: S on both columns; every Tahoe guide prints the code with a letter O (5LO); no zero form (5L0) is printed in GM lists

GM factory document — 2025 chevrolet new tahoe police package and special service fleet order guide, p.5.
GM factory document — 2026 chevrolet tahoe police package and special service fleet order guide, p.5.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.5.

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