Cadillac XTS License Plate Bulb Size

The Cadillac XTS license plate light requires a 12961 bulb size for proper illumination of the rear area. Data for the specified component covers the period from 2013 to 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 Type	Shop
2013-2019	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 Cadillac XTS uses the 12961 bulb for the license plate position across all model years listed, spanning 2013-2019.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, which is one of the most widely used bulb types in automotive auxiliary lighting positions.
The T10 designation refers to the bulb's tubular shape, with the number indicating its width in tenths of an inch, making it a compact bulb suited to low-profile housings such as license plate lamp assemblies.
The 12961 operates at 12 volts and 5 watts, which is consistent with standard automotive low-current auxiliary circuits used for illumination rather than signaling.
The base type is W2.1x9.5d, a wedge-style base that relies on tension from the socket rather than a bayonet or screw mechanism to maintain contact, which is a common trait among T10 bulbs used in license plate and interior positions.
Because the 12961 is a Philips-branded part number, equivalent bulbs from other manufacturers must share the T10 form factor, W2.1x9.5d base, 12V rating, and 5W output to be considered interchangeable in the Cadillac XTS license plate socket.