NU4 Factory-verified

Cadillac · Regular Production Option

Emission system, California, LEV2 plus

Years 2004–09 Models 9 Factory citations 16

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Also described as Emission system, California, LEV II plusEmission system, California LEV2 plus

Also documented for Buick Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

CTS — Sigma / GMX320 (2003–2007)

2004–2006 Factory-verified internal

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

DeVille — G-body (2000–2005)

2004 Factory-verified internal

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

Escalade EXT — GMT800 (2002–2006)

2004–2006 Factory-verified internal

GM factory document — 2004 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 internal

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)

2004–2006 Factory-verified internal

GM factory document — 2004 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 internal

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

SRX — Sigma / GMT265 (2004–2009)

2004–2006 Factory-verified internal

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

STS — Sigma (2005–2011)

2005, 2006 Factory-verified internal

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

XLR — Y-body (2004–2009)

2006 Factory-verified internal

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

This page aggregates every documented appearance of NU4 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.