Subaru Ascent Trunk Bulb Size

The Subaru Ascent trunk light requires a bulb with the specific 12961 size for proper installation and function within the rear cargo area. Data for the bulb requirements covers the period from 2019 through 2024.

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
2022-2024	12961
2019	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The Subaru Ascent uses the 12961 bulb for the trunk across the 2019 and 2022-2024 model years.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb with a width of approximately 10mm, commonly used in low-intensity interior lighting applications such as trunk and cargo area illumination.
The W2.1x9.5d base is a wedge-type fitting, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
At 5 watts, the 12961 operates at a low power draw, consistent with its role as an interior courtesy light rather than a high-output exterior lamp.
The W2.1x9.5d base type is a standardized fitting, and aftermarket T10 wedge bulbs sharing this base specification are generally interchangeable with the 12961 in compatible sockets, provided voltage and wattage ratings are observed.