Headlamps control, automatic, delay

Years 2001–09, 2014–19, 2022–26 Models 8 Factory citations 17

Also described as Control, headlamps, automatic, delayHeadlamp control, automatic with delayHeadlamps, automatic delayHeadlamp control, automatic, delay

Also documented for Buick Cadillac Chevrolet

Documented applications

Savana — GMT610 (2003–2027)

2014–2018, 2022–2026 Factory-verified

GM factory document — 2014 chevrolet gh van elec bbm si brief, p.7.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.16.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.14.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.

Sierra — GMT800 (1999–2007)

2001 Factory-verified

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

Sierra — GMT900 (2007–2013)

2009 Factory-verified

The 2009 list also prints a Delete entry for this code.

GM factory document — 2009 gmc 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 HD — GMT900 (2007–2014)

2009 Factory-verified

the 2009 list prints it with the delete wording of T78; the reading here is the corpus majority

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

Terrain — Second generation (D2XX) (2018–2024)

2019 Factory-verified

all trims: S

GM factory document — 2019 gmc terrain order guide copy gm authority, p.7, p.38.

Yukon — GMT800 (2000–2006)

2001–2006 Factory-verified

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.

Yukon — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2009 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of T74 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.