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Used for: Fog Light Bulb Front
Used for: Fog Light Bulb Front
Used for: Headlight Bulb High Beam
Used for: Headlight Bulb High Beam and Low Beam(Coupe, with HID headlights)
Used for: Headlight Bulb High Beam and Low Beam(Sedan)
Used for: Headlight Bulb Low Beam
Used for: Back Up Reverse Light Bulb
Used for: Daytime Running Light Bulb(Coupe, with HID headlights)
Used for: License Plate Light Bulb, Parking Light Bulb(Coupe), Dome Light Bulb
Used for: License Plate Light Bulb, Parking Light Bulb(Coupe), Dome Light Bulb
Used for: Side Marker Light Bulb Front(Coupe)
Used for: Stepwell Light Bulb
Used for: Turn Signal Light Bulb Front(Coupe)
Used for: Glove Box Light Bulb, Interior Door Light Bulb
Used for: Map Light Bulb
Used for: Trunk or Cargo Area Light
Used for: Vanity Mirror Light Bulb
This 2015 Cadillac CTS bulb size guide helps you verify the correct bulbs by lighting position before you buy replacements. Whether you are changing a headlight, tail light, brake light, or interior lamp, this page organizes the common bulb fitments for the 2015 CTS so you can match the right part to the right location.
The 2015 Cadillac CTS was offered in different body styles and lighting setups, so bulb type can vary by trim, package, and market. Use the bulb chart for the exact position you are servicing, and compare it with the bulb already installed in your car to make sure you get the correct fit and function.
Fitment can differ between sedan and coupe models, and between halogen and HID or LED-equipped vehicles. For example, some headlight and daytime running light applications use different bulb types depending on the package, and aftermarket LED conversions may not match the original beam pattern or connector style. Before ordering, check the bulb currently installed, confirm the socket and base style, and verify whether your CTS has factory LED, HID, or halogen lighting so you avoid buying the wrong replacement.
Start by matching the lighting position on the vehicle, such as low beam, high beam, tail light, or license plate light. Then compare the bulb type listed for that position with the bulb you remove from the car. This is the safest way to confirm fitment on the 2015 Cadillac CTS because trim and body style can change the required bulb.
Not always. The sedan and coupe can use different headlight, parking light, side marker, and turn signal bulb types. Always check the body style first, then use the bulb position listed for that specific version of the 2015 CTS.
The sedan listing shows D3S for the headlight bulb high beam and low beam application. That means the sedan uses a HID-style setup for those headlight positions on the listed configuration.
For the sedan, the low beam bulb is listed as H11 and the high beam bulb is listed as H9 on the applicable halogen setup. Always confirm your headlight type before ordering, since the sedan can have different lighting packages.
The front fog light bulb is listed as H11 LED or H16 LED. Because fog light fitment can vary with trim and lighting package, it is a good idea to verify the bulb already installed before purchasing a replacement.
The back up reverse light bulb is listed as 921. This is a common bulb type, but you should still confirm the socket and bulb style on your specific CTS before buying.
Both the license plate light bulb and dome light bulb are listed as 2825 or 98. If you are replacing interior or plate lighting, check whether your vehicle uses the same bulb in both places or a different installed variant.
For the coupe with HID headlights, the headlight bulb high beam and low beam application is listed as D1S. This is different from the sedan listings, so body style and headlight package matter a lot on the 2015 CTS.
For the coupe with HID headlights, the daytime running light bulb is listed as 5201 and the front turn signal bulb is listed as 12272NA. These are specific to the coupe lighting configuration shown on the page.
Yes, the listed tail light bulb, brake light bulb, and center high mount stop light bulb are LED. That means many rear lighting functions on this model are integrated LED setups rather than simple replaceable halogen bulbs.
Interior bulb listings include 2825 or 98 for the dome light, 906 for the glove box light and interior door light, 2886X for the stepwell light, 6612F for the vanity mirror light, 211-2 for the trunk or cargo area light, and PC175 for the map light. These positions can vary by trim and equipment level, so check your vehicle before ordering.
Yes, many owners choose aftermarket LED replacements for certain positions, but fitment and performance can vary. Make sure the bulb base matches, the bulb fits the housing, and the light pattern remains safe and legal for road use. For headlights and fog lights especially, check compatibility carefully before converting.
The 2015 Cadillac CTS could have different bulbs depending on sedan or coupe body style, factory lighting package, and market. That is why one CTS may use a different headlight or parking light bulb than another. Always use the exact position on your own vehicle as the final reference.