GMC Sierra Engine Compartment Light Bulb Size

GMC Sierra engine compartment light bulb uses 93 and 1156 bulb sizes for the specified component. The replacement chart covers vehicle production years from 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
2001-2002	93
1999-2000	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.	93
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The GMC Sierra engine compartment light uses two distinct bulb sizes across the 1999-2002 model years: the 93 and the 1156.
Both the 93 and 1156 are ANSI-standardized single-filament bulbs sharing the same BA15s bayonet base, which is a single-contact base with a 15mm barrel.
The 1156 operates at 12V and draws 21W, while the 93 operates at 12V and draws 13W, making the 93 a lower-wattage variant of the 1156.
The GMC Sierra (1999-2000) uses the 1156 bulb for the engine compartment light.
The 2001-2002 Sierra uses the 93 bulb for the same position, representing a shift to the lower-wattage variant.
Although both bulbs share the BA15s bayonet base and are physically interchangeable in terms of socket fitment, the wattage difference of 8W means they are not electrically equivalent replacements for one another.
Substituting a 1156 in place of a specified 93 would introduce a higher current draw than the circuit was designed for in the 2001-2002 application.