U2L Factory-verified

Cadillac · Regular Production Option

Digital audio system, L-band

Years 2003, 2005–06, 2023, 2025–26 Models 7 Factory citations 11

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Also described as Radio, HDHD Radio reception

Also documented for Buick Chevrolet GMC Pontiac Saturn

Documented applications

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 Factory-verified

GM factory document — 2023 cadillac ct5 v ct5 v blackwing fleet order guide wayback, p.1.

CTS — Sigma / GMX320 (2003–2007)

2005 Factory-verified

2005 list only; also on the 2005 STS list.

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

Escalade EXT — GMT800 (2002–2006)

2003 Factory-verified

GM factory document — 2003 cadillac escalade ext rpo code list, p.1.

Escalade — GMT800 (2002–2006)

2003 Factory-verified

GM factory document — 2003 cadillac escalade 2wd rpo code list, p.1.

Escalade — T1XX, 5th gen (2021–2027)

2023 Factory-verified

GM factory document — 2023 cadillac 23 escalade escalade esv electrical body builder sm en us 2022oct25, p.12.

STS — Sigma (2005–2011)

2005, 2006 Factory-verified

GM factory document — 2005 cadillac sts rpo code list, p.1.
GM factory document — 2006 cadillac sts rpo code list, p.1.

This page aggregates every documented appearance of U2L in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.