NB6 Factory-verified

GMC · Regular Production Option

Emission system, California, Tier 1

Years 1998–02 Models 8 Factory citations 17

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Also described as Emission system, CaliforniaEmissions, California Tier 1

Also documented for Buick Cadillac Chevrolet Oldsmobile Pontiac

Documented applications

Jimmy — second generation (1995–2001)

1998 Factory-verified internal

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.

Savana — GMT600 (1996–2002)

1998–2002 Factory-verified internal

the 2001–2002 lists read "California, Tier 1"

GM factory document — 1998 gmc savana rpo code list, p.1.
GM factory document — 1999 gmc savana rpo code list, p.1.
GM factory document — 2000 gmc savana rpo code list, p.1.
GM factory document — 2001 gmc savana rpo code list, p.1.
GM factory document — 2002 gmc savana rpo code list, p.1.

Sierra — GMT400 (1988–2000)

1998–2000 Factory-verified internal

GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.

Sierra — GMT800 (1999–2007)

1999–2000 Factory-verified internal

GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c sierra 2wd rpo code list, p.1.

Sonoma — second generation (1994–2004)

1998 Factory-verified internal

GM factory document — 1998 gmc sonoma pickup 4wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified internal

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified internal

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.
GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.

Yukon — GMT800 (2000–2006)

2000 Factory-verified internal

GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of NB6 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.