GMC Acadia Map Light Bulb Size

The GMC Acadia map light utilizes bulb sizes 12961 and 168 depending on the specific version of the vehicle. Available data for the bulb sizes covers the range from 2007 through 2019.

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
2017-2019	12961
2007-2016	168

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The GMC Acadia map light specifications cover model years 2007-2019 and reference two bulb sizes: 12961 and 168.
The 168 bulb is designated under the ANSI standard used in the US and Canada, and it fits the GMC Acadia across the 2007-2016 model years for map light applications.
Both the 168 and 12961 are T10 miniature wedge bulbs, meaning they share the same bulb body form factor.
The 168 operates at 12V and 4.9W, while the 12961 operates at 12V and 5W, placing them within the same low-wattage range typical of interior courtesy and map lighting.
The 12961 carries a Philips part number designation rather than an ANSI standard number, and it uses a W2.1x9.5d base, which is the standard wedge base specification for T10 bulbs.
The 12961 bulb applies to the 2017-2019 GMC Acadia map light position, representing a change from the 168 used in earlier model years.
Although both bulbs share the T10 body type, the differing part number designations (ANSI 168 vs. Philips 12961) indicate that fitment should be confirmed against the specific model year before substitution.
The W2.1x9.5d base on the 12961 is a metric designation describing the wedge base width and pin spacing, and it is the same base type found on the 168, supporting physical interchangeability at the socket level.