Audio system, Cadillac user experience, embedded and connected navigation with real-time traffic, AM/FM stereo, 8 inch diagonal color display, two USB ports, driver profiles, Natural Voice Recognition, Apple CarPlay and Android Auto capability, Teen Driver

Years 2018–19, 2023, 2025–26 Models 7 Factory citations 18

Also described as Audio system, Cadillac user experience with embedded navigation, AM/FM stereo, connected navigation, 8 inch color display, two USB ports, Apple CarPlay and Android Auto capabilityCadillac user experience with embedded navigationCadillac user experience, AM/FM stereo, 10 inch diagonal HD color information display, embedded navigationCadillac user experience with embedded navigation, AM/FM stereo with connected navigation providing real-time traffic, 8 inch diagonal color information displayCadillac user experience with embedded navigation, AM/FM stereo with connected navigation providing real-time traffic, 8" diagonal color information displayAudio system, Cadillac user experience, with embedded navigation

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

V-Series Blackwing: S; Luxury, Premium Luxury, Sport, V-Series: O

GM factory document — 2025 cadillac ct4 fleet order guide, p.19.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.2.
GM factory document — 2026 cadillac ct4 fleet order guide, p.17.
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.

CTS — Alpha (2014–2019)

2018–2019 Factory-verified

Vsport, Vsport Premium: S; letter O as GM prints it; 2019 per GM's 2019 CTS Sedan order guide (V-Sport and V-Sport Premium Luxury columns agree)

GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.2.
GM factory document — 2019 cadillac cts order guide copy gm authority, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

Premium Luxury, Sport: S; Luxury: not available

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

Premium Luxury: S; Sport: 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 IO6 with CUE version 3.0 (GM Authority 2018 XTS changes)

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