Cadillac ATS Parking Light Bulb Size

The Cadillac ATS parking light requires bulb size 7444NA or 7443NA depending on the specific configuration of the lighting assembly. Available data for the lighting components covers the range 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 Size
2019	7444NA
2015-2018	7443NA
2013-2014	7444NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7444NA
ANSI standard (US & Canada). Dual-filament wedge bulb (T20), natural amber glass. 12V, 21W/5W.	7443NA

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Additional Notes

The Cadillac ATS parking light specifications cover model years 2013-2019 and reference two bulb sizes: the 7444NA and the 7443NA.
Both the 7444NA and 7443NA are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical performance criteria.
Each bulb follows the T20 wedge form factor, which describes a wedge-shaped base that seats directly into a socket without a separate metal base or bayonet pins.
Both bulbs carry a dual-filament design, operating at 12 volts with a 21W high-output filament and a 5W low-output filament, allowing a single bulb to serve two distinct lighting functions within one housing.
The natural amber glass construction of both bulbs produces a yellow-orange light output without the use of a separate colored lens or filter, as the tint is built into the glass envelope itself.
The 7443NA is specified for the Cadillac ATS across the 2015-2018 model years, representing four consecutive years of consistent fitment for that bulb size.
The 7444NA is specified for the 2013, 2014, and 2019 model years, meaning the ATS began and ended its production run in these specifications with that particular bulb size.
Although the 7443NA and 7444NA share identical voltage, wattage, base type, and glass characteristics, they carry distinct ANSI part numbers and are not listed interchangeably within these specifications.