GMC Envoy Map Light Bulb Size

The GMC Envoy map light utilizes 12961 and 212-2 bulb sizes depending on the specific version of the vehicle. Available data covers the period from 2002 through 2009.

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
2004-2009	12961
2002-2003	212-2

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2

Other Locations

Additional Notes

The GMC Envoy map light uses two distinct bulb types across its model years: the 12961 for 2004-2009 and the 212-2 for 2002-2003.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, operating at 12V and 5W with a W2.1x9.5d base.
The 212-2 follows the ANSI standard recognized in the US and Canada, taking the form of a festoon bulb with a 41mm length and an SV8.5 base, rated at 12V and 12W.
The two bulb types are not interchangeable. The 12961 uses a wedge-style base, while the 212-2 uses a festoon-style base, making the mounting and retention mechanisms physically incompatible.
The wattage difference between the two types is notable. The 212-2 draws 12W compared to the 5W of the 12961, meaning the two bulbs place different electrical loads on the vehicle's lighting circuit.
The W2.1x9.5d base designation of the 12961 describes a wedge base with a 9.5mm pin spacing and a 2.1mm wire width, a format common in low-wattage interior lighting applications.
The SV8.5 base of the 212-2 is a festoon cap base with an 8.5mm cap width, a standard configuration for cylindrical bulbs held in spring-clip sockets.
The T10 designation of the 12961 refers to a tubular bulb with a nominal width of 10 eighths of an inch, a widely used size in automotive interior and courtesy lighting.