For the 2013 Cadillac CTS, headlight bulb fitment varies by the installed headlamp system. The low beam may use a D1S HID bulb or an H11 bulb, while the high beam may use D1S or H9. Confirm whether your CTS has HID or halogen/projector-style headlamps before ordering, since these bulbs are not interchangeable.
The fog lights use an H11 LED bulb. Front turn signal fitment also depends on the headlight configuration: CTS models with halogen headlights use a 2504 LED, while models with HID headlights use a 12272NA.
Other useful replacement sizes include:
- 5201 for daytime running lights
- 2825 for parking, dome, and license plate lights
- 194 for the front side marker
- 906 for the glove box and interior lights
- PC175 for map lights
Check the original bulb and headlight equipment when a configuration-specific option is listed.