Cadillac CT4 Bulb Size by Year
The 2020-2026 Cadillac CT4 has factory LED headlights, so there is no headlight bulb to replace.
Headlight bulbs by model year
| Model years | Low beam | High beam | Fog | Buy |
|---|---|---|---|---|
| 2020-2026 | LED | LED | - |
LED means the headlight is a sealed LED unit from the factory, so there is no bulb to buy. Some trims differ from the base car, so check the bulb you are removing. Shop links go to Amazon, and we may earn a commission at no extra cost to you. Open your exact year below for every bulb position and sources.
Every CT4 year
2026 Cadillac CT4LED2025 Cadillac CT4LED2024 Cadillac CT4LED2023 Cadillac CT4LED2022 Cadillac CT4LED2021 Cadillac CT4LED2020 Cadillac CT4LED
Sources. The bulb code for 0 of 7 model years is checked against a cited source, most often bulbcharts.com - Cadillac CT4 Bulb Guide and SEALIGHT - Cadillac CT4 Light Bulb Size Chart. Each year page lists its own sources.
Last verified 2026-06-19. Maintained by Matan B., who runs GarageDex. How we verify.