Cylinder unit, single key system, no specific code

Years 1983, 1993, 1999, 2001 Models 7 Factory citations 8

Also described as Key system, single, all units keyed individuallyKey system, single key for ignition and all locksSingle key cylinder system, no specific codeKey system, single, all units coded individually

Documented applications

Astro — First generation (1985–1994)

1993 Factory-verified

special equipment option.

GM Heritage factory kit — 1993 Chevrolet Astro Van, p.36.

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

1993 Factory-verified

SEO.

GM Heritage factory kit — 1993 Chevrolet G Van, p.67.

Impala — eighth generation (2000–2005)

2001 Factory-verified

GM factory document — 2001 chevrolet impala rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Impala, p.35.

Lumina — second generation (1995–2001)

1999 Factory-verified

Special equipment option.

GM factory document — 1999 chevrolet lumina rpo code list, p.1.

Malibu — fourth generation, A-body (1983)

1983 Factory-verified

special equipment option (SEO); minimum 25 orders; not with AW9

GM Heritage factory kit — 1983 Chevrolet Malibu, p.13.

Monte Carlo — fifth generation, W-body (1995–1999)

1999 Factory-verified

Special equipment option (SEO) in the list.

GM factory document — 1999 chevrolet monte carlo rpo code list, p.1.

Monte Carlo — sixth generation (2000–2007)

2001 Factory-verified

GM factory document — 2001 chevrolet monte carlo rpo code list, p.1.

This page aggregates every documented appearance of 6A4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.