17 Years Available
Cadillac Cts Light Bulb Sizes
Complete bulb size reference for the Cadillac Cts from 2003 to 2019. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
The Cadillac cts changed low beam specifications across model years — 2003–2015: HID-D1S LED; 2016–2019: HID-D3S LED. Make sure to select your exact year below to get the right bulb size.
Year Range
2003 – 2019
17 model yearsBulb Sizes Across Years
| Position | Bulb Type(s) | Years | Status |
|---|---|---|---|
| Low Beam | HID-D1S LED(2003–2015) HID-D3S LED(2016–2019) | 17 years | Changed |
| High Beam | HID-D1S LED(2008–2015) 9005XS LED(2003–2007) HID-D3S LED(2016–2019) | 17 years | Changed |
| Fog Light | H11 LED(2008–2015) 9145 LED(2003–2007) LED Fog Light(2016–2019) | 17 years | Changed |
| Brake Light | LED Bulb(2008–2019) PC175 LED(2003–2007) | 17 years | Changed |
| Side Marker | LED Bulb(2008–2019) 2825 LED(2003–2007) | 17 years | Changed |
| Turn Signal Front | 12272 LED or 12188NA(2008–2014) 2825 LED(2003–2007) LED Bulb(2016–2019) 12272 LED(2015–2015) | 17 years | Changed |
| Turn Signal Rear | LED Bulb(2008–2019) 3157K LED(2003–2007) | 17 years | Changed |
| Dome Light | 2825(2008–2019) PC175(2003–2007) 906(2014–2014) | 17 years | Changed |
| License Plate | 2825(2003–2019) | 17 years | Consistent |
| Map Light | PC175(2003–2019) | 17 years | Consistent |
| Parking Light | 2825(2003–2014) LED Bulb(2015–2019) | 17 years | Changed |
| Reverse Light | 921(2014–2019) LED Bulb(2008–2013) 3157K(2003–2007) | 17 years | Changed |
| Trunk Light | 211-2(2003–2019) | 17 years | Consistent |
Common Cts Replacement Parts
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Frequently Asked Questions
We have bulb size data for the Cadillac Cts from 2003 to 2019, covering 17 model years. Select your year below for a complete position-by-position bulb chart.
Yes, the Cadillac Cts changed low beam bulb specifications across generations: 2003–2015: HID-D1S LED; 2016–2019: HID-D3S LED. Make sure to check your exact year using the list below.
The Cadillac Cts uses a HID-D1S LED bulb for the low beam (same bulb serves both high and low beam via dual filament), and a H11 LED for the fog lights. Select your year below for the exact fitment chart.
Yes. The Cadillac Cts uses a HID-D1S LED low beam, and direct-fit LED conversion kits for that size are widely available. LED upgrades typically produce 2–3× more light output than stock halogen and last 25,000+ hours. Look for a DOT-compliant kit with a proper beam cutoff pattern.
Select your model year from the list below. Each year page shows every bulb position — low beam, high beam, fog light, turn signal, and brake light — with the correct size and a link to buy it on Amazon.