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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NB8 Factory-verified

    Chevrolet · Regular Production Option

    Emissions override, California

    Years 1994–10, 2014–27 Models 88 Factory citations 279
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    Also described as Emission override, California systemEmission system, override, California, Massachusetts or New YorkEmissions override, California or state requirements (with FE9)Emission override, CaliforniaEmission override, California and MassachusettsEmissions override, California, for federal emissionsEmission override, California and New York or MassachusettsEmission override, California, Massachusetts or New York, for vehicles ordered with federal emissionsEmissions override, California, Massachusetts or New YorkEmissions override, californiaEmission override, California, New York and MassachusettsEmission override, California, New York or MassachusettsEmission override, Massachusetts and New York stateEmissions override, California, Massachusetts and New YorkEmissions override, California systemEmissions override, California dealer ordering federal emissionsEmission override, California, Maine, Massachusetts, New York or VermontEmission override, California state

    Also documented for BuickCadillacGMCOldsmobilePontiacSaturn

    Documented applications

    Aveo — T200 (2004–2008)
    • 2004–2006 Factory-verified internal

      ; 2005 kit: for dealer orders in those states with federal emissions; requires FE9; ; ;

      GM Heritage factory kit — 2004 Chevrolet Aveo, p.24.
      GM Heritage factory kit — 2005 Chevrolet Aveo, p.25.
      GM Heritage factory kit — 2006 Chevrolet Aveo, p.25.
    Beretta — L-body (1987–1996)
    • 1994–1996 Factory-verified internal

      California/NY in 1994, California/MA in 1995–1996; same description as cavalier-gen2 and cavalier-gen3

      GM Heritage factory kit — 1994 Chevrolet Beretta, p.12.
      GM Heritage factory kit — 1995 Chevrolet Beretta, p.12.
      GM Heritage factory kit — 1996 Chevrolet Beretta, p.10.
    Blazer — C1XX (2019–2026)
    Blazer — S-10 second generation (1995–2005)
    Camaro — Gen 4 (1993–2002)
    • 1994–1998 Factory-verified internal
      GM Heritage factory kit — 1994 Chevrolet Camaro, p.7.
      GM Heritage factory kit — 1995 Chevrolet Camaro, p.8.
      GM Heritage factory kit — 1996 Chevrolet Camaro, p.14.
      GM Heritage factory kit — 1997 Chevrolet Camaro, p.8.
      GM Heritage factory kit — 1998 Chevrolet Camaro, p.9.
    City Express (2015–2018)
    Corsica — L-body (1987–1996)
    • 1994–1996 Factory-verified internal

      California/NY in 1994, California/MA in 1995–1996; same description as beretta-gen1

      GM Heritage factory kit — 1994 Chevrolet Corsica, p.10.
      GM Heritage factory kit — 1995 Chevrolet Corsica, p.8.
      GM Heritage factory kit — 1996 Chevrolet Corsica, p.6.
    Corvette — C4 (1984–1996)
    • 1994–1996 Factory-verified internal

      1994 prints California/NY (pp.25, 27), 1995–1996 California/MA; requires FE9 (1994)

      GM Heritage factory kit — 1994 Chevrolet Corvette, p.25.
      GM Heritage factory kit — 1995 Chevrolet Corvette, p.23.
      GM Heritage factory kit — 1996 Chevrolet Corvette, p.85.
    Corvette — C5 (1997–2004)
    • 1998–1999, 2003 Factory-verified internal

      Heritage order guides only: requires FE9; the state list differs by year (1998: California, New York, Massachusetts or Connecticut; 1999: ten northeastern and mid-Atlantic states and the District of Columbia, plus California; 2003: California, Maine, Massachusetts, New York or Vermont); the 1997 order guide prints this code as N88 and is not cited

      GM Heritage factory kit — 1998 Chevrolet Corvette, p.8.
      GM Heritage factory kit — 1998 Chevrolet Corvette, p.10.
      GM Heritage factory kit — 1999 Chevrolet Corvette, p.16.
      GM Heritage factory kit — 2003 Chevrolet Corvette, p.110.
      GM Heritage factory kit — 2003 Chevrolet Corvette, p.117.
      GM Heritage factory kit — 2003 Chevrolet Corvette, p.126.
    Corvette — C6 (2005–2013)
    • 2005–2006 Factory-verified internal

      Requires FE9. The 2006 order guide adds Vermont (HK 2006 p.111).

      GM Heritage factory kit — 2005 Chevrolet Corvette, p.99.
      GM Heritage factory kit — 2006 Chevrolet Corvette, p.111.
    Corvette — C7 (2014–2019)
    Corvette — C8 (2020–2027)
    Equinox — first generation (2005–2009)
    • 2005, 2007 Factory-verified internal

      for vehicles ordered by dealers in those states with federal emissions; requires FE9.

      GM Heritage factory kit — 2005 Chevrolet Equinox, p.90.
      GM Heritage factory kit — 2007 Chevrolet Equinox, p.92.
    Express — GMT600 (1996–2002)
    • 1996–1999 Factory-verified internal

      order guide emission override; requires FE9

      GM Heritage factory kit — 1996 Chevrolet G Van, p.67.
      GM Heritage factory kit — 1997 Chevrolet Express, p.26.
      GM Heritage factory kit — 1998 Chevrolet Express, p.20.
      GM Heritage factory kit — 1999 Chevrolet G Van, p.35.
    Express — GMT610 (2003–2027)
    Impala — eighth generation (2000–2005)
    Lumina — second generation (1995–2001)
    Monte Carlo — fifth generation, W-body (1995–1999)
    • 1995, 1998–1999 Factory-verified internal

      emissions. The guides word it California (1995) and as a state-requirement override (1998-1999, reqs FE9).

      GM Heritage factory kit — 1995 Chevrolet Monte Carlo, p.13.
      GM Heritage factory kit — 1998 Chevrolet Monte Carlo, p.11.
      GM Heritage factory kit — 1999 Chevrolet Monte Carlo, p.12.
    Monte Carlo — sixth generation (2000–2007)
    Motor Home chassis (1983–1998)
    • 1994–1998 Factory-verified internal

      requires FE9

      GM Heritage factory kit — 1994 Chevrolet Motorhome, p.7.
      GM Heritage factory kit — 1995 Chevrolet Motorhome, p.8.
      GM Heritage factory kit — 1996 Chevrolet Motorhome, p.8.
      GM Heritage factory kit — 1997 Chevrolet Motorhome, p.4.
      GM Heritage factory kit — 1998 Chevrolet Motorhome, p.7.
    Prizm — third generation (1998–2002)
    S-10 pickup — Second generation (1994–2004)
    Silverado EV — BT1 (2024–2027)
    Silverado HD — GMT800 (2001–2007)
    • 2005 Factory-verified internal

      the 2005 list prints it only in its light-duty half; the 2005 2500HD and 3500HD order guides list it

      GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.193.
    Silverado HD — K2XX (2015–2019)
    SSR (2003–2006)
    • 2003, 2005 Factory-verified internal

      kit guide wording; it requires FE9; the 2003 kit guide names California, Maine, Massachusetts, New York or Vermont, the 2005 kit guide California, Massachusetts or New York

      GM Heritage factory kit — 2003 And 2004 Chevrolet SSR, p.91.
      GM Heritage factory kit — 2005 Chevrolet SSR, p.99.
    Suburban — K2XX (2015–2020)
    Tahoe — GMT800 (2000–2006)
    • 2003, 2005–2006 Factory-verified internal

      for vehicles ordered by dealers in those states with Federal emissions, and it requires FE9; the 2005 and 2006 guides word the states as California, Massachusetts or New York

      GM Heritage factory kit — 2003 Chevrolet Tahoe, p.123, p.134, p.149.
      GM Heritage factory kit — 2005 Chevrolet Tahoe, p.123, p.134.
      GM Heritage factory kit — 2006 Chevrolet Tahoe, p.120, p.131.
    Tahoe — GMT900 (2007–2014)
    Tahoe — K2XX (2015–2020)
    TrailBlazer — GMT360 (2002–2009)
    • 2003, 2005–2007 Factory-verified internal

      for vehicles ordered by dealers in the named states with Federal emissions; the kits name different states in 2003 and in 2005–2007; the service lists do not print it

      GM Heritage factory kit — 2003 Chevrolet Trailblazer, p.123.
      GM Heritage factory kit — 2005 Chevrolet Trailblazer, p.119.
      GM Heritage factory kit — 2006 Chevrolet Trailblazer, p.133.
      GM Heritage factory kit — 2007 Chevrolet Trailblazer, p.134.
    Uplander (2005–2008)
    • 2005–2007 Factory-verified internal
      GM Heritage factory kit — 2005 Chevrolet Uplander, p.100.
      GM Heritage factory kit — 2006 Chevrolet Uplander, p.113.
      GM Heritage factory kit — 2007 Chevrolet Uplander, p.111.

    Related codes · mentioned in these notes

    1011111LS1LT1WT2LT2WT3LTFE9N88NA6PDF

    This page aggregates every documented appearance of NB8 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.