Radio, AM/FM stereo, seek/scan, auto reverse cassette, clock, ETR

Years 1984, 1986–91, 1998–02 Models 18 Factory citations 55

Also described as Radio, AM/FM stereo, ETR, seek and scan, stereo cassette tape, digital clockRadio, AM/FM stereo, electronically tuned, seek and scan, cassette tape, digital clockRadio, AM/FM stereo, seek/scan, stereo cassette, clock, ETRRadio, AM/FM stereo, seek/scan, auto-reverse cassette, clockRadio, AM/FM stereo, seek-scan, stereo cassette, clock, ETRRadio, AM/FM stereo, electronically tuned, seek and scan, stereo cassette tape, digital clockRadio, AM/FM stereo, seek and scan, cassette tape, digital clock, electronically tuned

Also documented for Buick Cadillac Chevrolet Oldsmobile Pontiac Saturn

Documented applications

Caballero — G-body (1983–1987)

1986–1987 Factory-verified

Shared G-body platform code; cited from the joint El Camino/Caballero pages of the Chevrolet El Camino kits

GM Heritage factory kit — 1986 Chevrolet El Camino, p.6.
GM Heritage factory kit — 1987 Chevrolet El Camino, p.41.

Jimmy (full-size) — Square body (1983–1991)

1990 Factory-verified

requires YE9; the 1986 book names UM6 only in the clock entry's exclusion remark (its radio line has no legible code), so 1986 is left out (the Chevrolet K5 Blazer doc claims it from that remark); the 1991 page prints this radio without a legible code; shared square-body platform code; cited from the Chevrolet Blazer kit

GM Heritage factory kit — 1990 Chevrolet Blazer, p.15.

Jimmy — second generation (1995–2001)

1998–2001 Factory-verified

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Jimmy — first generation (1983–1994)

1984, 1988–1989 Factory-verified

includes U66 in 1984 and 1988; shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.8.
GM Heritage factory kit — 1988 Chevrolet S 10 Blazer, p.9.
GM Heritage factory kit — 1989 Chevrolet Blazer, p.18.

Safari — First generation (1985–1994)

1986, 1988–1990 Factory-verified

the merged second-generation docs read the code with an auto reverse cassette; these pages print no auto reverse; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

GM Heritage factory kit — 1986 Chevrolet Astro Van, p.14.
GM Heritage factory kit — 1988 Chevrolet Astro Van, p.8.
GM Heritage factory kit — 1989 Chevrolet Astro Van, p.13.
GM Heritage factory kit — 1990 Chevrolet Astro Van, p.7.

Safari — Second generation (1995–2005)

1998–2001 Factory-verified

GM factory document — 1998 gmc safari 2wd rpo code list, p.1.
GM factory document — 1999 gmc safari 2wd rpo code list, p.1.
GM factory document — 2000 gmc safari 2wd rpo code list, p.1.
GM factory document — 2001 gmc safari 2wd rpo code list, p.1.

Savana — GMT600 (1996–2002)

1998–2002 Factory-verified

the 2001–2002 lists omit the auto reverse cassette

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

Sierra — GMT400 (1988–2000)

1998–2000 Factory-verified

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

Sierra — GMT800 (1999–2007)

1999–2001 Factory-verified

GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2001 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra — Square body (1983–1991)

1986, 1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits

GM Heritage factory kit — 1986 Chevrolet Truck, p.157.
GM Heritage factory kit — 1987 Chevrolet Truck, p.59.

Sonoma — first generation (1982–1993)

1987–1990 Factory-verified

the 1987 page prints seek and scan; the merged S-10 Blazer doc writes seek/scan; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1987 Chevrolet S 10, p.23.
GM Heritage factory kit — 1988 Chevrolet S 10, p.70.
GM Heritage factory kit — 1989 Chevrolet S 10, p.24.
GM Heritage factory kit — 1990 Chevrolet S 10, p.22.

Sonoma — second generation (1994–2004)

1998–2002 Factory-verified

GM factory document — 1998 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2000 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.

Suburban — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc gmc suburban 2wd rpo code list, p.1.
GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.

Suburban — Square body (1983–1991)

1986, 1989–1991 Single-source

includes dual rear speakers; the 1986 page does not say electronically tuned; the 1987 and 1988 pages name UM6 only in the U35 clock exclusion, so those years are left out; shared square-body platform code; cited from the Chevrolet Suburban kit; 1991 rests on the Chevrolet-only 1991 Suburban book, so the row is single-source

GM Heritage factory kit — 1986 Chevrolet Suburban, p.21.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.16.
GM Heritage factory kit — 1990 Chevrolet Suburban, p.18.
GM Heritage factory kit — 1991 Chevrolet Suburban, p.18.

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

1986, 1988–1990 Factory-verified

shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1986 Chevrolet G Van, p.25.
GM Heritage factory kit — 1988 Chevrolet Vandura, p.23.
GM Heritage factory kit — 1989 Chevrolet G Van, p.17.
GM Heritage factory kit — 1990 Chevrolet G Van, p.16.

Yukon — GMT400 (1992–1999)

1998–1999 Factory-verified

GM factory document — 1998 gmc yukon 2wd rpo code list, p.1.
GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.

Yukon — GMT800 (2000–2006)

2000–2002 Factory-verified

GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2002 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of UM6 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.