Engine modification, natural gas (conversion-ready engine)

Years 1993–08 Models 7 Factory citations 34

Also described as Engine modification, natural gasEngine, 6.0L V8, gaseous fuelModification, engine, natural gasEngine, alternative fuel, LPG or CNG conversion ready

Also documented for Chevrolet

Documented applications

Savana — GMT600 (1996–2002)

1998–2002 Factory-verified

the 2001–2002 Savana CNG lists read "Engine: 6.0 Liter V8, Gaseous Fuel"

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.
GM factory document — 2001 gmc savana cng rpo code list, p.1.
GM factory document — 2001 gmc savana rpo code list, p.1.
GM factory document — 2002 gmc savana cng rpo code list, p.1.
GM factory document — 2002 gmc savana rpo code list, p.1.

Savana — GMT610 (2003–2027)

2003–2006 Factory-verified

the 2003–2005 CNG lists read Engine: 6.0 Liter V8, gaseous fuel

GM factory document — 2003 gmc savana rpo code list, p.1.
GM factory document — 2003 gmc savana cng rpo code list, p.1.
GM factory document — 2005 gmc savana rpo code list, p.1.
GM factory document — 2005 gmc savana cng rpo code list, p.1.
GM factory document — 2006 gmc savana rpo code list, p.1.

Sierra — GMT400 (1988–2000)

1997–2000 Factory-verified

the 1997–2000 CNG lists word it as the engine; the C and K pickup lists word it as an engine modification for natural gas

GM factory document — 1997 gmc gmc c pickup 2wd cng rpo code list, p.1.
GM factory document — 1998 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1998 gmc gmc c pickup 2wd cng rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc c pickup 2wd cng rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd rpo code list, p.1.
GM factory document — 2000 gmc gmc c pickup 2wd cng rpo code list, p.1.

Sierra — GMT800 (1999–2007)

2001, 2003–2007 Factory-verified

2005–2007: heavy-duty models only (GM’s HD list)

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2003 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 — GMT800 (2001–2007)

2001, 2003–2007 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2004 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2006 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)

2007–2008 Factory-verified

GM factory document — 2007 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2008 gmc sierra 2wd rpo code list, p.1.

Vandura and Rally — Second generation G-series (1983–1996)

1993–1996 Single-source

requires the L05 5.7L engine; shared G-van platform code; cited from the Chevrolet G-Van kit; 1993–1996 rests on the Chevrolet-only G-Van books, so the row is single-source

GM Heritage factory kit — 1993 Chevrolet G Van, p.31.
GM Heritage factory kit — 1994 Chevrolet G Van, p.28.
GM Heritage factory kit — 1995 Chevrolet G Van, p.5.
GM Heritage factory kit — 1996 Chevrolet G Van, p.44.

This page aggregates every documented appearance of KL5 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.