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: D1S; 2016–2019: D3S. 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 / Shop |
|---|---|---|---|
| Low Beam | D1S(2003–2015) D3S(2016–2019) | 17 years | Changed |
| High Beam | D1S(2008–2015) 9005XS(2003–2007) D3S(2016–2019) | 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 |
| Reverse Light | 921(2014–2019) 3157K(2003–2007) | 11 years | Changed |
| Trunk Light | 211-2(2003–2019) | 17 years | Consistent |
| Door Light | 906(2008–2019) | 12 years | Consistent |
| Fog Light | H11(2008–2015) 9140(2003–2007) | 13 years | Changed |
| Turn Signal Front | 2825(2003–2007) 12272(2015–2015) | 6 years | Changed |
| Side Marker | 194(2008–2015) 2825(2003–2007) | 13 years | Changed |
| Parking Light | 2825(2003–2014) | 12 years | Consistent |
| Brake Light | PC175(2003–2007) | 5 years | Consistent |
| Turn Signal Rear | 3157K(2003–2007) | 5 years | Consistent |
| Daytime Running | 3157(2003–2006) 3157CK(2005–2007) | 5 years | Changed |
| Tail Light | 3157(2005–2007) 3157CK(2003–2004) | 5 years | Changed |
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: D1S; 2016–2019: D3S. Make sure to check your exact year using the list below.
The Cadillac Cts uses a D1S bulb for the low beam (same bulb serves both high and low beam via dual filament), and a H11 for the fog lights. Select your year below for the exact fitment chart.
Yes. The Cadillac Cts uses a D1S 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.