2003 Cadillac CTS Bulb Size

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Bulbs Chart

Headlight Bulb High Beam - 9005XS

Headlight Bulb Low Beam(with HID headlights) - D1S

Brake Light Bulb - 3157R

License Plate Light Bulb - 2825

Parking Light Bulb - 2825

Tail Light Bulb - 3157R

Side Marker Light Bulb Rear - 2825

Turn Signal Light Bulb Front Outer - 2825


2003 Cadillac CTS Headlight Bulb High Beam (9005XS)

    Halogen Lights

  • Nokya Arctic White 9005XS Car Headlight Bulb

    Nokya Arctic White Headlight Bulb Stage 2 - Provide the Xenon White Color in HID style. Auto Styling for Halogen headlight bulb upgrade to HID style Xenon White output.

See more 9005XS Halogen Lights

2003 Cadillac CTS Headlight Bulb Low Beam(with HID headlights) (D1S)

    Xenon HID Conversion Kit

  • Best Choice

    Philips D1S Standard Authentic Xenon

    Discover the xenon lighting solutions, one of the popular choices in xenon lighting. These xenon bulbs produce even more light to satisfy the most demanding drivers while maintaining their high Original Equipment quality and superior performance. Make sure to order genuine Original Equipment quality Xenon lighting from Philips, the inventor

See more D1S Xenon HID Conversion Kit

    LED Lights

  • Premium Quality

    VehiCode D1S/S1R/D1C LED Bulbs 6000K White

    2 x Epistar LED Chips are specially designed to have focused and wider beam to fit DOT required high or low beam pattern of original D1S D1R D1C HID Xenon bulb in reflector/projector headlight or fog light house - No dark spots will be caused. YOU MUST PAY ATTENTION: 1. D1S/R LED kit...

See more D1S LED Lights

2003 Cadillac CTS Brake Light Bulb (3157R)

    LED Lights

  • Best Choice

    Sylvania Zevo LED Red Bulb

    SYLVANIA ZEVO LED bulbs deliver a brighter, whiter, sharper light. As easy as changing a light bulb, you can have improved performance and safety for interior and exterior applications. World-class manufacturing and high-quality materials guarantee a lifetime warranty on your ZEVO bulbs. LED bulbs used for turn signals may require
  • Premium Pick

    Philips 3157 Ultinon LED Bulb (Red)

    Get stylish signaling with intense red light. Whether it’s for backup, stopping, or signaling, Philips Ultinon LED exterior lighting is designed to provide excellent light distribution. Philips Ultinon LED lights are direct replacements for conventional bulbs. They’re easy to install and available for a wide range of interior and exterior

See more 3157R LED Lights

2003 Cadillac CTS License Plate Light Bulb (2825)

    LED Lights

  • Premium Pick

    Sylvania White Mini Bulb

    SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively. 
  • For Car Dome, Map Door, Courtesy, License Plate Lights

    Marsauto LED Light Bulb 6000K Replacement Bulbs

    – Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes.  Products with electrical plugs

See more 2825 LED Lights

2003 Cadillac CTS Parking Light Bulb (2825)

    LED Lights

  • Premium Pick

    Sylvania White Mini Bulb

    SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively. 
  • For Car Dome, Map Door, Courtesy, License Plate Lights

    Marsauto LED Light Bulb 6000K Replacement Bulbs

    – Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes.  Products with electrical plugs

See more 2825 LED Lights

2003 Cadillac CTS Tail Light Bulb (3157R)

    LED Lights

  • Best Choice

    Sylvania Zevo LED Red Bulb

    SYLVANIA ZEVO LED bulbs deliver a brighter, whiter, sharper light. As easy as changing a light bulb, you can have improved performance and safety for interior and exterior applications. World-class manufacturing and high-quality materials guarantee a lifetime warranty on your ZEVO bulbs. LED bulbs used for turn signals may require
  • Premium Pick

    Philips 3157 Ultinon LED Bulb (Red)

    Get stylish signaling with intense red light. Whether it’s for backup, stopping, or signaling, Philips Ultinon LED exterior lighting is designed to provide excellent light distribution. Philips Ultinon LED lights are direct replacements for conventional bulbs. They’re easy to install and available for a wide range of interior and exterior

See more 3157R LED Lights

2003 Cadillac CTS Side Marker Light Bulb Rear (2825)

    LED Lights

  • Premium Pick

    Sylvania White Mini Bulb

    SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively. 
  • For Car Dome, Map Door, Courtesy, License Plate Lights

    Marsauto LED Light Bulb 6000K Replacement Bulbs

    – Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes.  Products with electrical plugs

See more 2825 LED Lights

2003 Cadillac CTS Turn Signal Light Bulb Front Outer (2825)

    LED Lights

  • Premium Pick

    Sylvania White Mini Bulb

    SYLVANIA LED bulbs deliver a balanced combination of performance and value. Tuners and auto enthusiasts alike can replace their vehicle’s incandescent lights with a bright and long-lasting LED bulb for a unique and modern look simply and cost-effectively. 
  • For Car Dome, Map Door, Courtesy, License Plate Lights

    Marsauto LED Light Bulb 6000K Replacement Bulbs

    – Better beam pattern: each bulb has 5 pcs high power SMD led, color temperature: 6000K(xenon white), voltage: 12V – No polarity no flip: it is truly no polarity, can light on two sides, no need more modification or flip, plug and play, easy install within 5 minutes.  Products with electrical plugs

See more 2825 LED Lights

2003 Cadillac CTS Headlights

2003 Cadillac CTS Tail Lights

Cadillac CTS Bulb Size By Years

Misconception: people often think bulb size charts are just a convenience, and any similar bulb will work for a 2003 Cadillac CTS. It seems true because many bulbs look alike and fit the socket, so swapping one feels easy and harmless. What is true is a little different. Think of it as a mental model where fit, base type, wattage, and beam pattern all matter for proper light and safety. The chart lists the exact bulb types your CTS originally used and compatible alternatives, acting as a practical rule of thumb so you avoid mismatches. Implications and quick tests: check the chart against your owner’s manual, match base and voltage, and test the new bulb before reassembling. Quick recap — use the chart to pick the right part, and note that links may be affiliate-supported. If you buy through them, I may earn a small commission at no extra cost to you.

2003 Cadillac CTS specs
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