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the lists add "use 2003 model year". The 2014–2016 guides read emission requirements for Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington.
NE1 Factory-verified
Also described as Emissions, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington requirementsEmissions, Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington state requirementsEmissions, Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington state requirementsEmissions, state requirementsEmissions, state requirements (Colorado, Maryland, Massachusetts, New Jersey, New York, Oregon, Rhode Island, Vermont and Washington in 2026)Emissions, geographically restricted registrationEmissions, state requirements for Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New Mexico, New York, Oregon, Pennsylvania, Rhode Island, Vermont and WashingtonEmissions certification, geographically restricted registration (up to 14,000 lb GVW)Emissions, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont and Washington requirementsCertification, emission, geographically restricted registration for vehicles up to 14,000 lbs GVW (use 2003 model year)Emissions, states that follow California rules (Connecticut, Delaware, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Washington)Emissions, states that follow California rules
Also documented for BuickCadillacChevroletHummerPontiacSaturn
Documented applications
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; all trims: O
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; O on all trims; the 2025 guide also lists Virginia; the 2026 and 2027 guides also list New Mexico; the 2026 and 2027 lists print only Emissions
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; 2015–2016: O on all trims; the upfitter lists name it geographically restricted registration; 2021 from the upfitter list GM files for 2021 and 2022
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; O on all trims; the 2025 guide also lists Virginia; the 2026 and 2027 guides also list New Mexico; the 2026 and 2027 lists print only Emissions; the upfitter lists read geographically restricted registration
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the lists add "Use 2003 Model Year" and misprint GVW as CVW.
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the 2025 lists name more states than the 2026 guide; the 2026 rpo-code lists print only "Emissions"
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the 2025 guide's state list is longer (it adds Connecticut, Delaware, Maine, Minnesota, Nevada, Pennsylvania and Virginia). 2025: O in 1SF, 1SG; 2026: O in 3VL, 1SF, 1SG.
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; the 2006–2009 lists add vehicles up to 14,000 lbs GVW (use 2003 model year); the 2025 guides list Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia and Washington state requirements, and the 2026–2027 guides read Emissions; O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT
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the state list differs by year (16 states in the 2025 guide, 5 in 2026, 14 in 2027); the rpo-code lists print the state names
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The list adds use 2003 model year.
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the lists add use 2003 model year
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2018: GM's 2018 Sierra 2500HD order guide; 2019: GM's 2019 Sierra 3500HD order guide
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the 2025 lists name Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia and Washington; the 2026 and 2027 lists print only "Emissions"
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the 2025 guide names Colorado, Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, Nevada, New Jersey, New York, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia and Washington; the upfitter lists read "Certification, emission, geographically restricted registration"
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; O on all trims; the 2025 guide also lists Virginia; the 2026 and 2027 guides also list New Mexico; the 2026 and 2027 RPO lists print only Emissions
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; 2018 from GM's 2018 Yukon order guide
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2027: O on all trims
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A on all trims
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2027: O on all trims
This page aggregates every documented appearance of NE1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.