Cadillac ATS License Plate Bulb Size

The Cadillac ATS license plate light requires a 12961 bulb size for proper illumination of the rear registration area. Available data covers the production span from 2013 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
2013-2019	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 Cadillac ATS uses the 12961 bulb for the license plate position across all listed model years, spanning 2013-2019.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor.
The T10 designation refers to the bulb's tubular shape, with the number indicating a width of 10 millimeters.
The 12961 uses a W2.1x9.5d wedge base, which is a capless design that relies on the glass envelope itself to make contact within the socket.
The bulb operates at 12 volts and draws 5 watts, placing it in the low-wattage range typical of illumination-only positions such as license plate lighting.
The W2.1x9.5d base type is also commonly referenced as a T10 wedge, and bulbs sharing this base configuration are generally interchangeable at the socket level, provided voltage and wattage ratings are compatible.