Cadillac ATS 2015 Bulb Size
Bulb size chart
This 2015 Cadillac ATS bulb size guide helps you verify the correct bulbs by lighting position, so you can replace a failed lamp with confidence. Whether you are changing a headlight, a tail light, or a small interior bulb, this page organizes the common fitment points for the ATS in one place.
The 2015 Cadillac ATS may use different bulbs depending on trim, lighting package, body style, and market. Use the bulb chart to match the location first, then confirm the bulb type before you buy. That is the best way to avoid ordering the wrong part for your car.
Fitment can vary on the 2015 ATS, especially between halogen and HID-equipped models and between standard and upgraded lighting packages. For example, the halogen headlight setup uses 9012 bulbs, while HID headlights use D3S bulbs. LED exterior lamps may also differ from one configuration to another, and aftermarket LED conversions can change beam pattern, brightness, or warning behavior. Before purchasing, check the bulb currently installed in your vehicle, compare it with the chart, and confirm the socket and connector style if you are replacing a bulb with an LED upgrade or a non-OEM part.
FAQ
What is the best way to find the right bulb for a 2015 Cadillac ATS?
Start with the lighting position, such as headlight, brake light, or license plate light, then match that position to the bulb type listed for the 2015 Cadillac ATS. This page is organized to help you verify bulb sizes by location instead of guessing from the bulb shape alone.
Does the 2015 Cadillac ATS use the same headlight bulb on every trim?
No. The 2015 Cadillac ATS can use different headlight bulbs depending on the lighting setup. Models with HID headlights use D3S, while models with halogen headlights use 9012.
What bulb does the 2015 Cadillac ATS use for halogen low and high beams?
The halogen headlight setup for the 2015 Cadillac ATS uses 9012 bulbs for the high beam and low beam application listed on this page.
What bulb does the 2015 Cadillac ATS use for HID low and high beams?
The HID headlight setup for the 2015 Cadillac ATS uses D3S bulbs for the high beam and low beam application listed on this page.
What bulb is used for the reverse lights on a 2015 Cadillac ATS?
The back up reverse light bulb listed for the 2015 Cadillac ATS is 921.
What bulb fits the front turn signal and parking light on a 2015 Cadillac ATS?
The front turn signal light bulb and the parking light bulb are both listed as 7444NA for the 2015 Cadillac ATS.
What bulb is used for the front side marker light?
The front side marker light bulb listed for the 2015 Cadillac ATS is 194NA.
What bulb is used for the rear side marker light?
The rear side marker light bulb on the 2015 Cadillac ATS is listed as LED on this page.
Are the brake lights and tail lights on the 2015 Cadillac ATS LED?
Yes. The bulb chart for the 2015 Cadillac ATS lists the brake light bulb and tail light bulb as LED.
What bulb is used for the center high mount stop light?
The center high mount stop light bulb for the 2015 Cadillac ATS is listed as LED.
What bulb fits the license plate lights on a 2015 Cadillac ATS?
The license plate light bulb options listed for the 2015 Cadillac ATS are 2825 and 98.
What bulb should I use for the trunk or cargo area light?
The trunk or cargo area light bulb options listed for the 2015 Cadillac ATS are 194 and 7441.
What bulb is used for interior door lights and stepwell lights?
For the 2015 Cadillac ATS, the interior door light bulb and the stepwell light bulb are both listed as 194 and 7441.
What bulb fits the vanity mirror light?
The vanity mirror light bulb listed for the 2015 Cadillac ATS is 7065.
Can I replace LED exterior bulbs with aftermarket LED parts on a 2015 Cadillac ATS?
Yes, but fitment and performance can vary. Aftermarket LED replacements may not match the original beam pattern or brightness, and some may require additional checks for compatibility. Always verify the exact bulb position and compare the installed bulb before buying.