What is the low beam headlight bulb size for a 2015 Cadillac CTS?

The 2015 Cadillac CTS uses a HID-D1S LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2015 Cadillac CTS?

The high beam bulb size for the 2015 Cadillac CTS is HID-D1S LED.

Why are my 2015 Cadillac CTS headlights dim?

Dim headlights on a 2015 Cadillac CTS can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a HID-D1S LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2015 Cadillac CTS fog light?

The 2015 Cadillac CTS uses a H11 LED bulb for the fog light position.

Is the 2015 Cadillac CTS single or dual beam?

The 2015 Cadillac CTS uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Can I install LED bulbs on my 2015 Cadillac CTS?

Yes, the 2015 Cadillac CTS comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a HID-D1S LED LED conversion kit for the low beams.

Does the 2015 Cadillac CTS have fog lights?

Yes, the 2015 Cadillac CTS takes a H11 LED bulb for the fog light position.

Did the 2015 Cadillac CTS change headlight bulb sizes from the previous year?

Yes — the 2015 Cadillac CTS uses different bulb sizes than the 2014 model. The 2015 generation introduced this bulb configuration.

Is the 2015 Cadillac CTS the first or last year to use HID-D1S LED bulbs?

The 2015 Cadillac CTS is the only year in the 2015 generation to use the HID-D1S LED bulb for the low beam headlight.

How do I change the headlight on a 2015 Cadillac CTS?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old HID-D1S LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2015 Cadillac CTS?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved HID-D1S LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2015 Cadillac CTS headlights?

A pair of HID HID-D1S LED bulbs costs $50 to $150. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2015 Cadillac CTS?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the HID-D1S LED position are available as direct plug-and-play replacements.

The 2015 Cadillac CTS has a unique bulb configuration not shared with adjacent model years.

Fitment Guaranteed for 2015 Cadillac CTS

What Size Bulbs Does a 2015 Cadillac CTS Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$50 - $150 (HID System)

What Lighting System Does the 2015 Cadillac CTS Have?

When it comes to nighttime visibility, the 2015 Cadillac CTS relies on an arrangement of 14 specialized bulbs. It features an extensive lighting system powered by premium factory HID/Xenon technology utilizing D1S projector housings for high-intensity output. This model belongs to the late years of the CTS's 2003-2019 production span.

Can You Put LED Bulbs in a 2015 Cadillac CTS?

The 2015 Cadillac CTS is already equipped with factory D1S HID/Xenon headlights. Since HID technology already provides exceptional brightness, we recommend staying with high-quality OEM replacement bulbs rather than attempting an LED retrofit for the primary headlights. However, the H11 LED fog lights are typically halogen and are excellent candidates for an LED upgrade to match the color temperature of your HID headlights.

2015 Cadillac CTS Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	HID-D1S LED	Buy HID-D1S LED →
High Beam	HID-D1S LED	Buy HID-D1S LED →
Fog Light	H11 LED	Buy H11 LED →
Brake Light	LED Bulb	Buy LED Bulb →
Side Marker	194	Buy 194 →
Turn Signal Front	12272 LED	Buy 12272 LED →
Turn Signal Rear	LED Bulb	Buy LED Bulb →
Dome Light	2825	Buy 2825 →
License Plate	2825	Buy 2825 →
Map Light	PC175	Buy PC175 →
Parking Light	LED Bulb	Buy LED Bulb →
Reverse Light	921	Buy 921 →
Trunk Light	211-2	Buy 211-2 →
Door Light	906	Buy 906 →

How do the 2015 Cadillac CTS's bulbs compare to other years?

The 2015 Cadillac CTS changed bulb sizes from 2014. The previous model year used a different configuration.

The 2016 model switched to a different bulb configuration.

This bulb configuration covers the 2015 model years. ← 2014 2016 →

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Other CTS Years

2019 2018 2017 2016 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003

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