Cadillac ATS 2019 Bulb Size

Bulb size chart

Headlight Bulb High Beam and Low Beam(with halogen headlights) - 9012
Headlight Bulb High Beam and Low Beam(with HID headlights) - D3S

9012 Bulbs

Used for: Headlight Bulb High Beam and Low Beam(with halogen headlights)

GLODRV 9012/HIR2 LED Mini Size Bulbs

GLODRV 9012/HIR2 LED Mini Size Bulbs

Illuminate the road ahead like never before with GloDrv 9012/HIR2 LED Fog Bulbs. Perfect for vehicles requiring [bulb type], these bulbs deliver an incredible 20,000 lumens of brightness, making them 600% brighter than standard options. The 6000K cool white light ensures every detail on the road is visible, enhancing your driving comfort and safety. Designed for easy installation, these bulbs feature a true 1:1 halogen lamp design, with a direct plug-and-play setup that takes just 5 minutes. The advanced matrix chip technology ensures a sharp, glare-free light that’s friendly to oncoming drivers, providing 360° illumination without dark spots. Built to last, GloDrv’s bulbs boast a lifespan of over 60,000 hours, thanks to a 16,000 rpm fan and liquid-cooled copper tube that keep them cool and efficient. With 99% vehicle compatibility, these bulbs are the ultimate upgrade for anyone seeking brighter, longer-lasting, and safer vehicle lighting.

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XtremeVision HID 9012 Replacement Bulbs

XtremeVision HID 9012 Replacement Bulbs

Upgrade your vehicle with superior brightness and performance using the XtremeVision Pro 9012 HID Xenon Bulbs. These are high-quality replacement bulbs that offer a bright white light at 5000K, projecting a daylight-like beam that increases visibility, reduces eye fatigue, and accentuates your vehicle's style in a most modern way. The XtremeVision Pro bulbs are 3X brighter than standard halogen bulbs for optimum visibility in low-light conditions. They operate on 35% less power for exceptional energy efficiency without compromising performance. Whether driving at night or through tough weather, they provide the clarity and confidence a driver needs on the road. These HID Xenon bulbs boast an extra-strong construction with a quartz glass tube that isolates the UV rays and a base resistant to water and heat. With a life 5 times longer than that of halogen bulbs, durability and reliability are assured, which makes this a very sound investment for any driver.All XtremeVision Pro bulbs boast a 100% plug-and-play wiring harness for fast and easy installation without modification. Compatible with 35W and 55W DC/AC HID ballasts, these bulbs go easily into your vehicle's existing setup. Compatibility Notes: This product requires HID ballasts to function; please check fitment for low beam, high beam, or fog lights.

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Sealight L2 Series

Sealight L2 Series

360-degree illumination: the ultra-thin design of the L2 9012 LED headlight bulb maximizes the concentration of light which significantly enhances the luminous output in reflector-style headlights. 200% brightness: thanks to its unique 360-degree design, the L2 outputs enough light to give a 200% brightness compared to halogen bulbs, allowing you to see farther and providing higher reflectivity. See more clearly: ditch your dim yellow halogen bulbs and make way for super-focused bright.

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View all 13 replacement options for size 9012 →

D3S Bulbs

Used for: Headlight Bulb High Beam and Low Beam(with HID headlights)

Philips D3S Standard Authentic Xenon HID

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 xenon automotive lighting helps drivers to concentrate on the road and to distinguish obstacles and road signs much faster than traditional lamps. *Compared to standard halogen bulbs

$79.99

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OSRAM XENARC D3S HID Xenon Headlight bulbs 66340

OSRAM XENARC D3S HID Xenon Headlight bulbs 66340

 Extremely Long Life with precise light distribution & consistent performance - can efficiently work for 4000 hours.  All HID lights discolor to get whiter/bluer over usage & dim down. When comparing this NEW bulb against your OLD bulb, the NEW bulb may look warmer in color, which is normal. Replacing in PAIR is suggested. Extremely Long Life with precise light distribution & consistent performance. 100% legal for On/Off-road use | Replace in pairs for optimal performance.

$108.99

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View all 10 replacement options for size D3S →

The 2019 Cadillac ATS uses different headlight bulb types depending on the lighting setup, so this page helps you verify the correct bulb size by lighting position before you buy parts. Whether your car has HID or halogen headlights, matching the bulb to the installed system is the safest way to avoid fitment problems.

For the 2019 Cadillac ATS, the available headlight bulb chart shows D3S for HID headlights and 9012 for halogen headlights. Because trim and lighting package can vary by market and body style, it is important to confirm the exact headlight type on your vehicle rather than assuming every ATS uses the same bulb.

Fitment can change with trim level, optional packages, and regional equipment, so the best approach is to check the bulb already installed in the headlamp before ordering replacements. HID and halogen systems are not interchangeable without the proper hardware, and LED aftermarket conversions may require additional adapters, resistors, or housings to work correctly. If your ATS has been modified, or if you are unsure whether it left the factory with HID or halogen headlights, compare the existing bulb, connector, and headlamp housing details before purchase to avoid buying the wrong part.

FAQ

What headlight bulb does a 2019 Cadillac ATS use?

The 2019 Cadillac ATS can use D3S bulbs for HID headlights or 9012 bulbs for halogen headlights, depending on the vehicle’s lighting setup.

How do I know whether my ATS has HID or halogen headlights?

Check the headlamp housing, the bulb already installed, and any vehicle equipment labels or owner documentation. The bulb type on this page is based on the installed headlight system, not just the model year.

Does every 2019 Cadillac ATS use the same headlight bulb?

No. The bulb can vary by trim, lighting package, market, and body style. That is why the page separates HID and halogen fitment.

Can I use a 9012 bulb in an HID headlight?

No. A 9012 bulb is listed for halogen headlights, while D3S is listed for HID headlights. The two systems are different and should not be mixed.

Can I replace HID bulbs with halogen bulbs on a 2019 Cadillac ATS?

Not as a simple bulb swap. HID and halogen headlights use different systems, so changing from one to the other usually requires more than just the bulb.

What should I check before buying a replacement bulb?

Verify the installed bulb type, confirm whether the car has HID or halogen headlights, and compare the connector and headlamp housing. This helps prevent ordering the wrong part.

Are LED replacement bulbs a direct fit for the 2019 Cadillac ATS?

Not always. Aftermarket LED conversions may need extra parts or may not fit or perform correctly in every housing, especially when replacing HID or halogen bulbs.

Why does the bulb size page list the same bulb for high beam and low beam?

On this model, the available chart shows one bulb type for the headlight system used in that configuration. The exact setup depends on whether the car has HID or halogen headlights.

Can the bulb type differ between coupe and sedan versions of the ATS?

Yes, body style and market can affect lighting equipment. Always confirm the specific vehicle configuration before ordering.

What is the safest way to replace a headlight bulb on a 2019 Cadillac ATS?

Use the correct bulb type for the installed system, work carefully to avoid touching the glass on halogen bulbs, and make sure the bulb is seated properly before closing the housing.

If my ATS has been modified, can I still use this bulb chart?

The chart is most reliable for factory-style equipment. If the headlights have been changed or converted, check the installed parts directly before buying replacements.

Why is it important to verify bulb size by lighting position?

Different lighting positions and headlight systems can use different bulb types. Verifying by position helps make sure you match the correct bulb to the correct headlamp setup on your 2019 Cadillac ATS.

Cadillac ATS Bulb Size by Year