NC1 ✓ Factory-verified

Hummer · Regular Production Option

Emission system, California, LEV

Years 2004–06 Models 1 Factory citations 2

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Also documented for BuickCadillacChevroletGMCOldsmobilePontiacSaturn

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2004–2006 ✓ Factory-verified internal

  the 2006 list says not to be used after the 2007 model year for domestic NAO passenger cars and light duty trucks.

  ⛭ GM factory document — 2004 hummer h2 rpo code list, p.1.

  ⛭ GM factory document — 2006 hummer h2 rpo code list, p.1.

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