LQ4 ✓ Factory-verified

Hummer · Regular Production Option

Engine, gas, 8 cylinder, 6.0L, multiport fuel injection, iron, GM

Years 2003–08 Models 1 Factory citations 3

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Also documented for ChevroletGMC

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2003–2008 ✓ Factory-verified

  the 2003–2005 lists print 8 CYC for 8 cylinders; the 2006 list prints "*" for the count and the 2007 list leaves it blank; the 2008 list reads only "6.0L, multiport fuel injection".

  ⛭ GM factory document — 2003 hummer h2 rpo code list, p.1.

  ⛭ GM factory document — 2008 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 LQ4 in the Hummer reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.