U2K Factory-verified

Cadillac · Regular Production Option

Digital audio system, S-band

Years 2002–09, 2014–15, 2023, 2025–27 Models 23 Factory citations 65

Query this via API →

Also described as SiriusXM satellite radio, 3 month trialSiriusXM with 360LSiriusXM with 360L, trial subscription

Also documented for Buick Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

ATS — Alpha (2013–2019)

2014–2015 Factory-verified

3 month trial; the 2014 guide: not available with Y24

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.

CT4 — Alpha 2 (2020–2026)

2025–2026 Factory-verified

all trims: S

GM factory document — 2025 cadillac ct4 fleet order guide, p.1.
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.2.
GM factory document — 2026 cadillac ct4 v ct4 v blackwing fleet order guide, p.2.

CT5 — Alpha 2 (2020–2026)

2023, 2025–2026 Factory-verified

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

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.1.
GM factory document — 2026 cadillac ct5 fleet order guide, p.2.
GM factory document — 2025 cadillac ct5 v ct5 v blackwing fleet order guide, p.2.
GM factory document — 2026 cadillac ct5 v ct5 v blackwing fleet order guide, p.2.

CTS — Sigma II (2008–2015)

2008–2009, 2014 Factory-verified

The 2014 guides list it as SiriusXM satellite radio with a 3-month trial; 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)

2004–2007 Factory-verified

GM factory document — 2004 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)

2003–2006 Factory-verified

GM factory document — 2003 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)

2003–2006 Factory-verified

GM factory document — 2003 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 — 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.12.
GM factory document — 2025 cadillac new escalade escalade v fleet order guide, p.2.
GM factory document — 2027 cadillac escalade escalade v fleet order guide, p.2.

Lyriq — BEV3 (2023–2027)

2023, 2025–2027 Factory-verified

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

The 2004, 2005 and 2007 to 2009 lists print 5-Band, an apparent misprint; the 2006 list and U2J read S-Band.

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.

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.56.
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

GM factory document — 2025 cadillac xt4 fleet order guide, p.2.
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.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

All trims: S

GM factory document — 2025 cadillac xt6 fleet order guide, p.2.
GM factory document — 2025 cadillac xt6 fleet order guide, p.65.

This page aggregates every documented appearance of U2K in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.