UE1 Factory-verified

Cadillac · Regular Production Option

Communication system, vehicle, GPS 1

Years 2002–09, 2014–18, 2023, 2025–27 Models 27 Factory citations 79

Also described as OnStar, 1 year planOnStar and Cadillac connected services capableOnStar services capableOnStar Guidance Plan, 1 yearOnStar communication systemOnStar capableOnStar Guidance Plan, 1 year, including automatic crash response, stolen vehicle assistance, roadside assistance, turn-by-turn navigation and advanced diagnostics (trial excludes hands-free calling)

Also documented for Buick Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

ATS — Alpha (2013–2019)

2014–2015, 2018 Factory-verified

Directions and Connections plan in 2014–2015, Guidance plan in 2018 for retail sales through 4/30/2018

GM factory document — 2014 cadillac ats fleet order guide wayback, p.4.
GM factory document — 2015 cadillac ats coupe fleet order guide wayback, p.2.
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.
2018 Factory-verified

another reading of UE1, for retail sales from 5/1/2018

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

all trims: S

GM factory document — 2025 cadillac ct4 fleet order guide, p.3.
GM factory document — 2025 cadillac ct4 v ct4 v blackwing fleet order guide, p.3.
GM factory document — 2026 cadillac ct4 fleet order guide, p.3.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.3.

CT5 — Alpha 2 (2020–2026)

2023, 2025–2026 Factory-verified

Premium Luxury, Sport: S; V-Series, V-Series Blackwing: S; the 2023 list reads OnStar and Cadillac connected services capable

GM factory document — 2023 cadillac ct5 v ct5 v blackwing fleet order guide wayback, p.1.
GM factory document — 2025 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 fleet order guide rpo codes, p.1.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide rpo codes, p.1.
GM factory document — 2025 cadillac ct5 fleet order guide, p.3.
GM factory document — 2026 cadillac ct5 fleet order guide, p.3.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.3.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.3.

CT6 — Omega (2016–2020)

2017 Factory-verified

all trims; Automatic Crash Response, Stolen Vehicle Assistance, Roadside Assistance, Turn-by-Turn Navigation and Advanced Diagnostics; the trial excludes Hands-Free Calling

GM factory document — 2017 cadillac ct6 fleet order guide wayback, p.2.

CTS — Alpha (2014–2019)

2014–2015, 2018 Factory-verified

Vsport, Vsport Premium: S; Directions and Connections plan in 2014–2015, Guidance Plan in 2018 for retail sales through 4/30/2018

GM factory document — 2014 cadillac cts sedan fleet order guide wayback, p.2.
GM factory document — 2015 cadillac cts sedan fleet order guide wayback, p.2.
GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.2.
2018 Factory-verified

another reading of UE1, for retail sales from 5/1/2018; Vsport, Vsport Premium: S

GM factory document — 2018 cadillac cts sedan fleet order guide wayback, p.2.

CTS — Sigma II (2008–2015)

2008–2009, 2014 Factory-verified

The 2014 guides list it as OnStar with 1 year of the Directions and Connections plan; every 2014 coupe and the CTS-V Sedan: S

GM factory document — 2008 cadillac cts rpo code list, p.1.
GM factory document — 2009 cadillac cts rpo code list, p.1.
GM factory document — 2014 cadillac cts coupe and cts v coupe fleet order guide wayback, p.1.
GM factory document — 2014 cadillac cts v sedan fleet order guide wayback, p.2.

CTS — Sigma / GMX320 (2003–2007)

2003–2007 Factory-verified

GM factory document — 2003 cadillac cts rpo code list, p.1.
GM factory document — 2007 cadillac cts rpo code list, p.1.

DeVille — G-body (2000–2005)

2002–2005 Factory-verified

GM factory document — 2002 cadillac deville rpo code list, p.1.
GM factory document — 2005 cadillac deville rpo code list, p.1.

DTS — G-body (2006–2011)

2006–2009 Factory-verified

GM factory document — 2006 cadillac dts rpo code list, p.1.
GM factory document — 2009 cadillac dts rpo code list, p.1.

Escalade EXT — GMT800 (2002–2006)

2002–2006 Factory-verified

GM factory document — 2002 cadillac escalade ext rpo code list, p.1.
GM factory document — 2006 cadillac escalade ext rpo code list, p.1.

Escalade EXT — GMT900 (2007–2013)

2007–2009 Factory-verified

GM factory document — 2007 cadillac escalade ext rpo code list, p.1.
GM factory document — 2009 cadillac escalade ext rpo code list, p.1.

Escalade — GMT800 (2002–2006)

2002–2006 Factory-verified

GM factory document — 2002 cadillac escalade 2wd rpo code list, p.1.
GM factory document — 2006 cadillac escalade rpo code list, p.1.

Escalade — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 cadillac escalade rpo code list, p.1.
GM factory document — 2009 cadillac escalade rpo code list, p.1.

Escalade IQ — Ultium BEV (2025–2027)

2025–2027 Factory-verified

GM factory document — 2025 cadillac all electric escalade iq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric escalade iql fleet order guide rpo codes, p.1.

Escalade — K2XX (2015–2020)

2015–2017 Factory-verified

2015: S on all trims, with the 1 year Directions and Connections plan

GM factory document — 2015 cadillac escalade 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.15.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.34.

Escalade — T1XX, 5th gen (2021–2027)

2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.13.
GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.3.
GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.5.

Lyriq — BEV3 (2023–2027)

2023, 2025–2027 Factory-verified

the 2023 list reads OnStar and Cadillac connected services capable; all trims: S; Professional Vehicle (S)

GM factory document — 2023 cadillac all new electric lyriq fleet order guide wayback, p.3.
GM factory document — 2025 cadillac all electric lyriq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric lyriq professional vehicle fleet order guide rpo codes, p.1.

Optiq — BEV3 (2025–2027)

2025–2027 Factory-verified

GM factory document — 2025 cadillac all electric optiq fleet order guide rpo codes, p.1.
GM factory document — 2027 cadillac all electric optiq optiq v fleet order guide rpo codes, p.1.

Seville — G-body (1998–2004)

2002–2004 Factory-verified

GM factory document — 2002 cadillac seville rpo code list, p.1.
GM factory document — 2003 cadillac seville rpo code list, p.1.
GM factory document — 2004 cadillac seville rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2004–2009 Factory-verified

GM factory document — 2004 cadillac srx rpo code list, p.1.
GM factory document — 2009 cadillac srx rpo code list, p.1.
GM factory document — 2006 cadillac srx rpo code list, p.1.

SRX — Theta Premium / GMT166 (2010–2016)

2016 Confirmed

all trims: S; GM's 2016 SRX order guide (GM Authority's copy, published September 18, 2015)

STS — Sigma (2005–2011)

2005–2009 Factory-verified

GM factory document — 2005 cadillac sts rpo code list, p.1.
GM factory document — 2009 cadillac sts rpo code list, p.1.

Vistiq — BEV3 (2026–2027)

2026–2027 Factory-verified

all trims: S

GM factory document — 2026 cadillac all electric vistiq fleet order guide, p.57.
GM factory document — 2027 cadillac all electric vistiq fleet order guide, p.57.

XLR — Y-body (2004–2009)

2004–2009 Factory-verified

GM factory document — 2004 cadillac xlr rpo code list, p.1.
GM factory document — 2009 cadillac xlr rpo code list, p.1.

XT4 — E2 (2019–2025)

2025 Factory-verified

Premium Luxury, Sport: S; service plan required

GM factory document — 2025 cadillac xt4 fleet order guide, p.3.
GM factory document — 2025 cadillac xt4 fleet order guide rpo codes, p.1.

XT5 — C1XX (2017–2026)

2025–2026 Factory-verified

all trims: S

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.3.
GM factory document — 2025 cadillac xt5 fleet order guide, p.23.
GM factory document — 2026 cadillac xt5 fleet order guide, p.4.
GM factory document — 2026 cadillac xt5 fleet order guide, p.23.

XT6 — C1XX (2020–2025)

2025 Factory-verified

All trims: S

GM factory document — 2025 cadillac xt6 fleet order guide, p.3.
GM factory document — 2025 cadillac xt6 fleet order guide, p.65.

This page aggregates every documented appearance of UE1 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.