Adaptive cruise control with front automatic braking

Years 2015–19 Models 2 Factory citations 9

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Also documented for Cadillac Chevrolet

Documented applications

Yukon — K2XX (2015–2020)

2015–2019 Factory-verified

2015: part of PCX on Denali; 2016: requires UV6; SLT, Denali; K34 left off when ordered; 2019 named Adaptive Cruise Control - Advanced; the lists read sales package ESS 2, and the Escalade K2XX doc reads it as Driver Assist Package; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.2.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.2.
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.
GM factory document — 2019 gmc yukon denali fleet order guide wayback, p.1.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.24.

Yukon XL — K2XX (2015–2020)

2015–2017 Factory-verified

SLE: not available; SLT, Denali: A; 2015: only with PCX; 2016: requires UV6; the lists read sales package ESS 2; the Escalade K2XX doc reads it as the Driver Assist Package

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.2.
GM factory document — 2016 gmc yukon xl denali 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.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.

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