Y66 Factory-verified

Cadillac · Regular Production Option

Driver assist package

Years 2014–19, 2025–26 Models 6 Factory citations 21

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Also described as Driver Assist Package

Also documented for Chevrolet GMC

Documented applications

ATS — Alpha (2013–2019)

2014–2015, 2018 Factory-verified

adds adaptive cruise control KSG and automatic braking to the Y65 content

GM factory document — 2014 cadillac ats fleet order guide wayback, p.7.
GM factory document — 2015 cadillac ats coupe fleet order guide wayback, p.3.
GM factory document — 2018 cadillac ats coupe fleet order guide wayback, p.3.
GM factory document — 2018 cadillac ats sedan fleet order guide wayback, p.3.

CTS — Alpha (2014–2019)

2014–2015, 2018–2019 Factory-verified

Vsport: not available; includes AX7, KSG, UGN and UVZ; the 2015 guide marks it a late model year availability; 2019 per GM's 2019 CTS Sedan order guide (V-Sport and V-Sport Premium Luxury columns agree)

GM factory document — 2014 cadillac cts sedan fleet order guide wayback, p.3.
GM factory document — 2015 cadillac cts sedan fleet order guide wayback, p.3.
GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.3.
GM factory document — 2019 cadillac cts order guide copy gm authority, p.13.

Escalade — K2XX (2015–2020)

2015–2017 Factory-verified

includes KSG, UGN, UVZ and AX7; the lists read sales package ESS 2

GM factory document — 2015 cadillac escalade fleet order guide wayback, p.3.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.19.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.39.

Lyriq — BEV3 (2023–2027)

2025 Factory-verified

all trims: S

GM factory document — 2025 cadillac all electric lyriq fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

2025: Premium Luxury, Sport: O; Luxury: not available; 2026: Sport: S; Premium Luxury: O; 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.13.
GM factory document — 2025 cadillac xt5 fleet order guide, p.28.
GM factory document — 2026 cadillac xt5 fleet order guide, p.7.
GM factory document — 2026 cadillac xt5 fleet order guide, p.14.
GM factory document — 2026 cadillac xt5 fleet order guide, p.28.

XT6 — C1XX (2020–2025)

2025 Factory-verified

Premium Luxury: O; Sport: O; upgrades UHY to UGN and UVZ

GM factory document — 2025 cadillac xt6 fleet order guide, p.15.
GM factory document — 2025 cadillac xt6 fleet order guide, p.66.

This page aggregates every documented appearance of Y66 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.