Audio system, Cadillac user experience, AM/FM stereo, 8 inch color display, two USB ports, Apple CarPlay and Android Auto capability

Years 2018, 2023, 2025–26 Models 6 Factory citations 16

Also described as Cadillac user experienceCadillac user experience, AM/FM stereo, 10 inch diagonal HD color information displayCadillac user experience, AM/FM stereo with 8 inch diagonal color information displayCadillac user experience, AM/FM stereo with 8" diagonal color information displayAudio system, Cadillac user experience

Also documented for Buick Chevrolet GMC

Documented applications

ATS — Alpha (2013–2019)

2018 Factory-verified

GM prints the code with a letter O and no zero form appears in GM's lists

GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.2.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.2.
GM factory document — 2018 cadillac ats v fleet order guide wayback, p.2.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

Luxury, Premium Luxury, Sport, V-Series: S

GM factory document — 2025 cadillac ct4 fleet order guide, p.8.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.9.
GM factory document — 2026 cadillac ct4 fleet order guide, p.2.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.2.

CT5 — Alpha 2 (2020–2026)

2023 Factory-verified

GM factory document — 2023 cadillac ct5 v ct5 v blackwing fleet order guide wayback, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

Luxury: S; Premium Luxury, Sport: not available

GM factory document — 2025 cadillac xt5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac xt5 professional vehicles fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac xt5 fleet order guide, p.1.
GM factory document — 2025 cadillac xt5 fleet order guide, p.19.
GM factory document — 2026 cadillac xt5 fleet order guide, p.2.
GM factory document — 2026 cadillac xt5 fleet order guide, p.20.

XT6 — C1XX (2020–2025)

2025 Factory-verified

Luxury: S

GM factory document — 2025 cadillac xt6 fleet order guide, p.2.
GM factory document — 2025 cadillac xt6 fleet order guide, p.62.

XTS — Epsilon II, enlarged (2013–2019)

2018 Confirmed

replaces IO5 with CUE version 3.0 (GM Authority 2018 XTS changes)

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