GMC Sierra Parking Brake Indicator Bulb Size

GMC Sierra parking brake indicator bulb uses a 74 size bulb for this component. The replacement chart covers vehicle production spanning 1999 to 2002.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1999-2002	74

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74

Other Locations

Additional Notes

The GMC Sierra uses the 74 bulb for the parking brake indicator across the 1999-2002 model years.
The 74 bulb follows the ANSI standard, which is the recognized classification system for miniature bulbs in the United States and Canada.
It is a T5 miniature wedge type, meaning it seats by friction through a wedge-shaped base rather than a bayonet or screw fitting.
The 74 bulb operates at 12 volts and draws 1.4 watts, placing it among the lower-wattage bulbs used in instrument panel indicator applications.
The wedge base format of the 74 bulb means fitment depends on the physical size and pin spacing of the socket, and substituting a visually similar wedge bulb of a different designation risks an improper fit or incorrect electrical load.