NC7 Factory-verified

GMC · Regular Production Option

Emissions override, federal

Years 1998–02, 2005–10, 2014–19, 2025–27 Models 30 Factory citations 88

Also described as Emissions override, FederalEmission override, federal systemEmissions override, federal, for YF5 or NE1 vehicles sold in federal states

Also documented for Buick Cadillac Chevrolet Oldsmobile Pontiac Saturn

Documented applications

Acadia — first generation, Lambda (2007–2017)

2014–2016 Factory-verified internal

for vehicles ordered by dealers in Federal-emission states with YF5 or NE1 emissions.

GM factory document — 2014 gmc acadia fleet order guide wayback, p.4.
GM factory document — 2015 gmc acadia fleet order guide wayback, p.4.
GM factory document — 2016 gmc acadia fleet order guide wayback, p.4.

Acadia — Second generation (C1XX) (2017–2023)

2017–2019 Factory-verified internal

; for dealers in federal-emissions states

GM factory document — 2017 gmc acadia order guide copy gm authority, p.13, p.25.
GM factory document — 2018 gmc acadia order guide copy gm authority, p.16, p.33.
GM factory document — 2019 gmc acadia order guide copy gm authority, p.17, p.35.

Acadia — Third generation (2024–2027)

2025–2027 Factory-verified internal

; O on all trims; for dealers in federal-emission states ordering vehicles with YF5 or NE1 emissions

GM factory document — 2025 gmc acadia fleet order guide, p.21.
GM factory document — 2026 gmc acadia fleet order guide, p.21.
GM factory document — 2027 gmc acadia fleet order guide, p.22.

Canyon — Second generation (GMT31XX) (2015–2022)

2015–2016 Factory-verified internal

; O on all trims

GM factory document — 2015 gmc canyon fleet order guide wayback, p.7.
GM factory document — 2016 gmc canyon fleet order guide wayback, p.2.

Canyon — Third generation (VSS-T) (2023–2027)

2025–2027 Factory-verified internal

; O on all trims

GM factory document — 2025 gmc canyon fleet order guide, p.19.
GM factory document — 2026 gmc canyon fleet order guide, p.26.
GM factory document — 2027 gmc canyon fleet order guide, p.27.

Hummer EV Pickup (2022–2027)

2025–2026 Factory-verified internal

GM factory document — 2025 gmc hummer ev pickup fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc hummer ev pickup fleet order guide rpo codes, p.1.

Hummer EV SUV — BT1 (2024–2027)

2025–2026 Factory-verified internal

SUV guide wording: Emissions override, Federal (for Federal-state dealers ordering YF5 or NE1 emissions). the state list in GM's text changed between the 2025 and 2026 guides. 2025: O in 1SF, 1SG; 2026: O in 3VL, 1SF, 1SG.

GM factory document — 2025 gmc hummer ev suv fleet order guide, p.24.
GM factory document — 2026 gmc hummer ev suv fleet order guide, p.29.

Jimmy — second generation (1995–2001)

1999–2001 Factory-verified internal

GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Safari — Second generation (1995–2005)

1998 Factory-verified internal

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

Savana — GMT600 (1996–2002)

1998–2000 Factory-verified internal

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.

Savana — GMT610 (2003–2027)

2006–2010, 2014–2016, 2025–2027 Factory-verified internal

; the 2006–2009 lists read Emission Override - Federal System; O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2006 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.17.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.15.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.15.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.7.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.9.
GM factory document — 2025 gmc savana cargo fleet order guide, p.31.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.39.
GM factory document — 2025 gmc savana passenger fleet order guide, p.23.
GM factory document — 2026 gmc savana cargo fleet order guide, p.33.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.42.
GM factory document — 2026 gmc savana passenger fleet order guide, p.25.
GM factory document — 2027 gmc savana cargo fleet order guide, p.30.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.21.
GM factory document — 2027 gmc savana passenger fleet order guide, p.23.

Sierra EV — BT1 (2024–2027)

2025–2027 Factory-verified internal

GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra ev denali fleet order guide, p.10.
GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra ev fleet order guide, p.20.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified internal

; for vehicles ordered by dealers in federal emission states with YF5 or NE1 emissions

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.45.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra — GMT400 (1988–2000)

1998 Factory-verified internal

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

Sierra — GMT800 (1999–2007)

2005–2007 Factory-verified internal

GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

Sierra HD — GMT900 (2007–2014)

2014 Factory-verified internal

GM factory document — 2014 gmc sierra 2500hd fleet order guide wayback, p.4.
GM factory document — 2014 gmc sierra 3500hd fleet order guide wayback, p.4.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified internal

; for dealers in states with YF5 or NE1 emissions; 2018: GM's 2018 Sierra 2500HD order guide; 2019: GM's 2019 Sierra 3500HD order guide

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.4.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.24.
GM factory document — 2019 gmc sierra 3500hd order guide copy gm authority, p.23.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified internal

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Sierra — K2XX (2014–2019)

2014, 2016, 2018–2019 Factory-verified internal

GM factory document — 2014 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.89.
GM factory document — 2019 gmc sierra 1500 limited double cab k2xx order guide copy gm authority, p.40.

Sierra — T1XX (2019–2026)

2025–2026 Factory-verified internal

GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sonoma — second generation (1994–2004)

1999–2002 Factory-verified internal

GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2000 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998 Factory-verified internal

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

Terrain — First generation (2010–2017)

2016–2017 Factory-verified internal

for vehicles ordered by dealers in Federal-emission states with YF5 or NE1 emissions; requires YF5 or NE1

GM factory document — 2016 gmc terrain fleet order guide wayback, p.4.
GM factory document — 2017 gmc terrain fleet order guide wayback, p.4.

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified internal

GM factory document — 2019 gmc terrain order guide copy gm authority, p.44.

Terrain — Third generation (2025–2027)

2025–2027 Factory-verified internal

; O on all trims; for federal-emissions-state dealers ordering vehicles with YF5 or NE1 emissions; requires YF5 or NE1

GM factory document — 2025 gmc next generation terrain fleet order guide, p.9.
GM factory document — 2026 gmc next generation terrain fleet order guide, p.13.
GM factory document — 2027 gmc terrain fleet order guide, p.14.

Yukon — GMT400 (1992–1999)

1998 Factory-verified internal

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

Yukon — K2XX (2015–2020)

2015–2016, 2018 Factory-verified internal

; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.33.

Yukon — T1XX (2021–2027)

2025–2027 Factory-verified internal

2027: O on all trims

GM factory document — 2025 gmc new yukon denali fleet order guide, p.37.
GM factory document — 2026 gmc yukon denali fleet order guide, p.39.
GM factory document — 2027 gmc yukon fleet order guide, p.34.

Yukon XL — K2XX (2015–2020)

2015–2016 Factory-verified internal

requires YF5 or NE1

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon xl denali fleet order guide wayback, p.4.

Yukon XL — T1XX (2021–2027)

2025–2027 Factory-verified internal

2027: O on all trims

GM factory document — 2025 gmc new yukon xl denali fleet order guide, p.40.
GM factory document — 2026 gmc yukon xl denali fleet order guide, p.41.
GM factory document — 2027 gmc yukon xl fleet order guide, p.36.

This page aggregates every documented appearance of NC7 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.