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 Type	Shop
2022-2024	12961	Check Price
2019	12961	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price

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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.