Lamp, roof marker, five

Years 1984–91, 1998–09, 2014–15, 2018–19, 2025–27 Models 12 Factory citations 47

Also described as Roof marker lamps (five)Lamp, five, roof marker, truckLamps, roof marker, smoked amberLamps, roof marker, smoked amber, LEDLamps, roof marker

Also documented for Cadillac Chevrolet

Documented applications

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)

2000–2001, 2003–2007 Factory-verified

the 2000–2001 lists print it with a letter O (UO1)

GM factory document — 2000 gmc gmc c sierra 2wd rpo code list, p.1.
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 — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2001, 2003–2007 Factory-verified

the 2001 list prints it with a letter O (UO1)

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)

2007–2009, 2014 Factory-verified

the 2014 guides describe smoked amber roof marker lamps

GM factory document — 2007 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2008 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2014 gmc sierra 2500hd fleet order guide wayback, p.3.
GM factory document — 2014 gmc sierra 3500hd fleet order guide wayback, p.3.

Sierra HD — K2XX (2015–2019)

2015, 2018–2019 Factory-verified

not with California emissions (YF5); 2015 marks: Sierra, SLE, SLT: O; 2018: GM's 2018 Sierra 2500HD order guide; 2019: GM's 2019 Sierra 3500HD order guide

GM factory document — 2015 gmc sierra 2500hd fleet order guide wayback, p.3.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.20.
GM factory document — 2019 gmc sierra 3500hd order guide copy gm authority, p.18.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

not available with the California emissions requirements (YF5) on single rear wheels

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Sierra — Square body (1983–1991)

1985–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; included with R05 dual rear wheels; 1984 is left out: the 1984 page names U01 only in another option’s contents and its option line prints UDI; the kit pages also print UO1

GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
GM Heritage factory kit — 1987 Chevrolet Truck, p.58.

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)

1984–1991 Single-source

not with YF5; the 1989 and 1991 pages print UOI and UO1; 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 — 1984 Chevrolet Suburban, p.22.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.19.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.20.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.25.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.18.
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.

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)

2000–2006 Factory-verified

the 2000–2001 lists print UO1 (letter O) and word it as five roof marker lamps

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.
GM factory document — 2003 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2004 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2005 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2006 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of U01 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.