T78 Factory-verified

GMC · Regular Production Option

Headlamps control, delete

Years 1999, 2002–09 Models 6 Factory citations 19

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Also described as Headlamp control (automatic), deleteHeadlamp control, delete

Also documented for Buick Cadillac Chevrolet Oldsmobile Pontiac

Documented applications

Envoy — GMT360 (2002–2009)

2003–2009 Factory-verified

GM factory document — 2003 gmc envoy 2wd rpo code list, p.1.
GM factory document — 2009 gmc envoy 4wd rpo code list, p.1.

Sierra — GMT800 (1999–2007)

1999, 2002–2007 Factory-verified

GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2002 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)

2002–2007 Factory-verified

GM factory document — 2002 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.

Yukon — GMT800 (2000–2006)

2002, 2004–2006 Factory-verified

GM factory document — 2002 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.

Yukon — GMT900 (2007–2014)

2007–2008 Factory-verified

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

This page aggregates every documented appearance of T78 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.