NC1 Factory-verified

Cadillac · Regular Production Option

Emission system, California, LEV

Years 1999–06 Models 9 Factory citations 21

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Also described as Emission system, California LEV

Also documented for Buick Chevrolet GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

Catera — V-body (1997–2001)

1999–2001 Factory-verified internal

the 1999 list prints "California Emissions"

GM factory document — 1999 cadillac catera rpo code list, p.1.
GM factory document — 2000 cadillac catera rpo code list, p.1.
GM factory document — 2001 cadillac catera rpo code list, p.1.

CTS — Sigma / GMX320 (2003–2007)

2003–2006 Factory-verified internal

GM factory document — 2003 cadillac cts rpo code list, p.1.
GM factory document — 2006 cadillac cts rpo code list, p.1.

DeVille — G-body (2000–2005)

2003 Factory-verified internal

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

Escalade EXT — GMT800 (2002–2006)

2002–2006 Factory-verified internal

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 — GMT400-based, GMT435 (1999–2000)

1999–2000 Factory-verified internal

GM factory document — 1999 cadillac escalade rpo code list, p.1.
GM factory document — 2000 cadillac escalade rpo code list, p.1.

Escalade — GMT800 (2002–2006)

2002–2006 Factory-verified internal

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

Seville — G-body (1998–2004)

2000–2004 Factory-verified internal

GM factory document — 2000 cadillac seville rpo code list, p.1.
GM factory document — 2001 cadillac seville rpo code list, p.1.
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.

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)

2004–2006 Factory-verified internal

The 2005 and 2006 lists add a note that it is not to be used after the 2007 model year for domestic passenger cars and light trucks.

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

This page aggregates every documented appearance of NC1 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.