GMC K2500 Suburban Map Light Bulb Size

The GMC K2500 Suburban map light utilizes bulb sizes 168 and 211-2 depending on the specific production period for the vehicle. Available data covers the range from 1992 through 1999.

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	168
1998	211-2
1994-1997	168
1993	211-2
1992	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The GMC K2500 Suburban map light draws from two distinct bulb types across its 1992-1999 model years: the 168 and the 211-2.
The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, conforming to ANSI standards applicable in both the US and Canada.
The T10 designation refers to a tubular bulb with a width of approximately 10 thirty-seconds of an inch, fitted with a wedge-style base that requires no separate socket pins.
The 211-2 is a festoon-style bulb with an SV8.5 base, a 41mm length, and a rating of 12V and 12W, also conforming to ANSI standards for the US and Canadian markets.
A festoon bulb is a cylindrical lamp that mounts by pressing its end caps into spring-loaded contacts, a fitment method physically incompatible with the wedge socket used by the 168.
At 12W, the 211-2 draws more than twice the wattage of the 4.9W 168, meaning the two bulbs are not interchangeable despite both operating at 12V.
The GMC K2500 Suburban used the 168 bulb for the map light in 1992 and again in 1994-1997 and 1999.
The 211-2 festoon bulb was specified for the map light in the 1993 and 1998 model years.
The alternating pattern of bulb types across model years indicates that the correct size must be confirmed against the specific model year before a replacement is sourced.