Engine modification, natural gas (conversion-ready engine)

Years 1993–08 Models 8 Factory citations 41

Also described as Engine, 2.2L, gaseous fuel (CNG bi-fuel)Engine, 6.0L V8, gaseous fuelEngine modification, natural gasEngine, alternative fuel, LPG or CNG conversion readyModification, engine, natural gas

Also documented for GMC

Documented applications

Cavalier — third generation (1995–2005)

1998–2002 Factory-verified

only in: CNG bi-fuel cars

GM factory document — 1998 chevrolet cavalier cng rpo code list, p.1.
GM factory document — 2002 chevrolet cavalier cng rpo code list, p.1.

C/K pickup — 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 chevrolet chevy c pickup 2wd cng rpo code list, p.1.
GM factory document — 1998 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 1998 chevrolet chevy c pickup 2wd cng rpo code list, p.1.
GM factory document — 1999 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy c pickup 2wd cng rpo code list, p.1.
GM factory document — 2000 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet chevy c pickup 2wd cng rpo code list, p.1.

Express — GMT600 (1996–2002)

1997–2002 Factory-verified

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

GM factory document — 1998 chevrolet express rpo code list, p.1.
GM factory document — 1999 chevrolet express rpo code list, p.1.
GM factory document — 2000 chevrolet express rpo code list, p.1.
GM factory document — 2001 chevrolet express cng rpo code list, p.1.
GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express cng rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.
GM Heritage factory kit — 1997 Chevrolet Express, p.26.

Express — GMT610 (2003–2027)

2003–2006 Factory-verified

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

GM factory document — 2003 chevrolet express rpo code list, p.1.
GM factory document — 2004 chevrolet express awd rpo code list, p.1.
GM factory document — 2005 chevrolet express rpo code list, p.1.
GM factory document — 2006 chevrolet express rpo code list, p.1.

Chevy Van — Second generation G-series (1983–1996)

1993–1996 Factory-verified

requires the L05 5.7L engine; the merged ck-gmt400 doc reads KL5 as a 6.0L gaseous fuel engine (1997–2000).

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.

Silverado — GMT800 (1999–2007)

2001, 2003–2007 Factory-verified

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

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado, p.56.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.60.

Silverado HD — GMT800 (2001–2007)

2001–2007 Factory-verified

years from Heritage kit pages, not in GM’s service list of that year: 2002 (kit list)

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado HD, p.62.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.41.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.192.

Silverado HD — GMT900 (2007–2014)

2007–2008 Factory-verified

GM factory document — 2007 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet silverado 2wd rpo code list, p.1.

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