GMC Envoy XL Map Light Bulb Size

The GMC Envoy XL map light requires 12961 or 212-2 bulb sizes depending on the specific version of the lighting component. Available data for the bulb sizes covers the range from 2002 through 2006.

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
2004-2006	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 XL map light specification calls for two distinct bulb types across its production run, with the required bulb differing based on model year.
The 2004-2006 GMC Envoy XL uses the 12961 bulb, a miniature wedge type with a T10 form factor and W2.1x9.5d base, rated at 12V and 5W.
The T10 wedge base is a push-in style connector that relies on two metal contacts on the sides of the bulb's plastic wedge, requiring no separate socket pins or bayonet locking.
The 12961 is a Philips part number designation rather than an ANSI or SAE industry-standard code, meaning cross-referencing with other manufacturers requires matching the T10 wedge form factor and 5W rating.
The 2002-2003 Envoy XL uses the 212-2 bulb, a festoon type with an SV8.5 base and a 41mm length, rated at 12V and 12W.
A festoon bulb makes contact at both ends of its cylindrical body, fitting between two spring clips inside the lamp housing rather than inserting into a socket.
The 212-2 carries an ANSI standard designation recognized in both the United States and Canada, making it a widely cross-referenced part number across multiple manufacturers.
The 12961 operates at 5W while the 212-2 operates at 12W, meaning the two bulb types draw significantly different amounts of current and are not electrically interchangeable despite both running on 12V systems.
The physical mounting styles of the two bulbs, wedge versus festoon, are mechanically incompatible, so the correct bulb type must correspond to the housing design present in the specific model year.
A 2003 Envoy XL and a 2004 Envoy XL therefore require different map light bulbs, making model year verification necessary before selecting a replacement.