2015 Cadillac CTS Bulb Size

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Bulbs Chart

Headlight Bulb High Beam - H9

Headlight Bulb Low Beam - H11

Headlight Bulb High Beam and Low Beam(Coupe, with HID headlights) - D1S

Headlight Bulb High Beam and Low Beam(Sedan) - D3S

License Plate Light Bulb - 2825

Back Up Reverse Light Bulb - 921

Parking Light Bulb(Coupe) - 2825

Daytime Running Light Bulb(Coupe, with HID headlights) - 5201

Dome Light Bulb - 2825


2015 Cadillac CTS Headlight Bulb High Beam (H9)

    LED Lights

  • #1 Bestseller

    Sealight L2 Series

    Simple installation: it’s been designed as a plug-and-play lighting solution, so does not need the help of a mechanic to fit into most cars. No pain of replacing bulbs often: a maximum level of heat dissipation is achieved when they are in use thanks to the ball-bearing cooling fan, the copper

See more H9 LED Lights

    Halogen Lights

  • Premium Pick

    PIAA 19665 H9 Xtreme White Plus

    If you’re looking for better visibility on your road, then Xtreme White Hybrid bulbs should be at the top of your list. These high-quality glasses and alloy filaments provide more contrast to what can sometimes become dim or dull light from stock lamps so that way not only do they

See more H9 Halogen Lights

2015 Cadillac CTS Headlight Bulb Low Beam (H11)

    LED Lights

  • Editor's Choice

    Cougar Motor LED

    True 1:1 Size: Extreme 1:1 design of Cougar Motor's new generation plug-in led bulb is comparable to the original bulb, without additional wiring harness and drive. To ensure a smooth installation, there is no need to worry about modifying the fixed lamp housing, easy upgrade and replace the halogen bulbs
  • #1 Bestseller

    Sealight L2 Series

    600% Brighter: These LED bulbs use double-sided LED chips. 6000K xenon white provides a clear vision for night driving, earlier detecting obstacles ahead, maximizing the driver's reaction time Safer Light Pattern: 0.04-inch ultra-thin board design improves light concentration, no shadows or glare, without blinding other drivers to ensure absolute safety for you and oncoming

See more H11 LED Lights

    Halogen Lights

  • Premium Pick

    PIAA 15211 H11 Xtreme White Plus

    Cold pressed aluminum and poly blended bases reduce the vibration of the bulb by over 30% while pulling heat away from the filament and globe. Thus giving the user more performance and reducing the likely hood of premature burn out due to excessive vibration. Direct replacements for your vehicle's stock bulbs.
  • Premium Pick

    PIAA 15211 H11 Xtreme White Plus

    Xtreme White Hybrid bulbs are worth it if you want the lightest possible. They're brighter and provide better contrast versus stock, allowing drivers to see farther with greater safety on dark roads or high traffic areas like city streets at night time - because these lights don't have any filters...
  • Perfect for Off-Roading

    HELLA H11 YL Twin Blister Xtreme Yellow Bulb

    Illuminate your path with the Xtreme Yellow Car Light Bulbs, designed to deliver unmatched visibility in challenging weather conditions. Perfect for all vehicles that require a [bulb type], these bulbs are the go-to choice for drivers seeking enhanced safety and performance. These high-performance bulbs produce a crisp yellow light with a...

See more H11 Halogen Lights

2015 Cadillac CTS Headlight Bulb High Beam and Low Beam(Coupe, 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

2015 Cadillac CTS Headlight Bulb High Beam and Low Beam(Sedan) (D3S)

    Xenon HID Conversion Kit

  • Best Choice, D3C

    Philips D3S Standard Authentic Xenon HID

    POWERFUL LIGHT FROM XENON HID BULBS OFFER MAXIMUM SAFETY: Xenon HID (High Intensity Discharge) headlight bulbs offer twice as much light* for safer driving in all conditions while consuming 50% less power. The intense white light produced by the Xenon HID lamps is comparable to daylight. Studies have demonstrated that...

See more D3S Xenon HID Conversion Kit

2015 Cadillac CTS License Plate Light Bulb (2825)

    Halogen 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. 

See more 2825 Halogen Lights

    LED Lights

  • 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

2015 Cadillac CTS Back Up Reverse Light Bulb (921)

    Halogen Lights

  • Best Choice

    Philips 12789LPB2 Bright White Vision

    Replace your standard car lights with our robust Philips Vision LEDs that deliver dynamic lighting for your vehicle, both inside and out. The innovative design and unmatched performance of Philips Vision LEDs are available for brake and taillights, backup lights, dome lights, and license plate lights. These bulbs are covered

See more 921 Halogen Lights

2015 Cadillac CTS Parking Light Bulb(Coupe) (2825)

    Halogen 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. 

See more 2825 Halogen Lights

    LED Lights

  • 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

2015 Cadillac CTS Daytime Running Light Bulb(Coupe, with HID headlights) (5201)

    LED Lights

  • Premium Quality

    Auxbeam 5201/5202/9009 LED Fog Light Bulbs, 6500K Xenon White

    Introducing the Auxbeam 5201/5202/9009 LED Fog Light Bulbs, the perfect solution for upgrading your vehicle's fog lights. With their 6500K Xenon White color, these bulbs not only provide a stylish look but also offer enhanced visibility on the road. Featuring advanced 3030-16SMD chipsets, these bulbs deliver high power LED illumination...

See more 5201 LED Lights

2015 Cadillac CTS Dome Light Bulb (2825)

    Halogen 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. 

See more 2825 Halogen Lights

    LED Lights

  • 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

2015 Cadillac CTS Headlights

2015 Cadillac CTS Tail Lights

Cadillac CTS Bulb Size By Years

Goal: If you’re replacing bulbs on a 2015 Cadillac CTS, this chart helps you match sockets to correct bulb types quickly. Many people waste time guessing sizes or buying incompatible bulbs; the list solves that by showing standard fits for headlights, turn signals, brake lights, and interior lamps. Prerequisites and step by step: Confirm your CTS trim and model year, expose the lamp housing or consult the owner’s manual, then match the socket designation on the chart to the replacement part. A recommended trade-off is choosing OEM-equivalent bulbs for fit and lifespan versus higher-output aftermarket options for brightness. Validation, troubleshooting, and wrap up: Validate fit by dry-fitting a new bulb before powering the circuit and check alignment and function. If a bulb doesn’t seat or the connector differs, note that trim variations can alter sockets. Disclosure: some links on this page are affiliate links; I may earn a commission at no extra cost to you, which helps support maintaining accurate charts.

2015 Cadillac CTS specs
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