Cadillac ATS Luggage Compartment Bulb Size

The Cadillac ATS luggage compartment utilizes a bulb size of 168 for the specific lighting area. Data for the lighting specifications covers the range from 2018 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
2018-2019	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The T10 miniature wedge is the bulb format used in the Cadillac ATS luggage compartment across the 2018-2019 model years. This format features a wedge-shaped base that seats directly into a socket without requiring a separate bayonet or screw fitting.
The 168 designation follows ANSI standardization, meaning the bulb meets defined electrical and physical criteria recognized across the United States and Canada.
The 168 bulb operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of interior illumination applications where heat output and power consumption are kept minimal.
Both the 2018 and 2019 ATS share an identical luggage compartment bulb specification, indicating full interchangeability between those two model years for this application.