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Fitment Guaranteed for 2019 Cadillac XT4

What Size Bulbs Does a 2019 Cadillac XT4 Use?

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

Installation Difficulty

Moderate (Dust covers often present)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2019 Cadillac XT4 Have?

The 2019 Cadillac XT4 features an extensive lighting system with 11 bulb positions. It uses factory LED technology with integrated LED headlight modules.

Can You Put LED Bulbs in a 2019 Cadillac XT4?

Upgrading the 2019 Cadillac XT4 to LED headlights is straightforward since it uses a single LED Headlights dual-filament bulb for both low and high beams. You only need one pair of LED bulbs to upgrade both functions. Look for a LED Headlights LED kit that specifically supports dual-filament operation to ensure both beams work correctly. For the fog lights, a LED Fog Light LED bulb provides a clean white output that pairs well with LED headlights.

How to Replace Bulbs on a 2019 Cadillac XT4

To remove the headlight bulb, disconnect the wiring harness, then twist the bulb counter-clockwise and pull it straight out of the housing. On the 2019 XT4, you will likely encounter rubber dust covers behind the headlight housing. These pull off by hand or unscrew depending on the design. Allow about 15 to 20 minutes per side. This vehicle has factory-integrated LED headlight modules. These are not user-serviceable bulbs. If your LED headlights fail, the entire headlight assembly or LED module may need to be replaced by a dealer or qualified technician. The fog lights are accessed from underneath the front bumper. You may need to remove a few plastic clips or screws from the fender liner to reach the LED Fog Light fog light socket.

Full Upgrade Bundle

Upgrade All 11 Positions at Once

Low Beam: LED HeadlightsHigh Beam: LED HeadlightsFog Light: LED Fog LightBrake Light: LED BulbSide Marker: LED BulbTurn Signal Front: 7444NA LEDTurn Signal Rear: LED BulbLicense Plate: LED BulbParking Light: 7444NAReverse Light: 921Trunk Light: LED Light
Shop Complete LED Kit

2019 Cadillac XT4 Complete Bulb Size Chart

PositionBulb SizeShop
Low Beam
LED HeadlightsBuy LED Headlights
High Beam
LED HeadlightsBuy LED Headlights
Fog Light
LED Fog LightBuy LED Fog Light
Brake Light
LED BulbBuy LED Bulb
Side Marker
LED BulbBuy LED Bulb
Turn Signal Front
7444NA LEDBuy 7444NA LED
Turn Signal Rear
LED BulbBuy LED Bulb
License Plate
LED BulbBuy LED Bulb
Parking Light
7444NABuy 7444NA
Reverse Light
921Buy 921
Trunk Light
LED LightBuy LED Light

Want to upgrade everything at once?

Shop Complete LED Kit for 2019 Cadillac XT4
Installation Guide
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How Long Do 2019 Cadillac XT4 Headlight Bulbs Last?

Factory LED headlights on the 2019 Cadillac XT4 are rated for approximately 25,000 to 50,000 hours of use, which translates to roughly 10 to 15 years of normal driving. LED modules rarely burn out suddenly. Instead, they gradually dim over time or develop dead zones within the LED array. At 7 years old, the original bulbs on your XT4 are likely overdue for replacement, though LED modules may still have life left. Even if they still illuminate, reduced brightness significantly impacts nighttime safety. When one headlight burns out, replace both sides at the same time. Bulbs from the same batch age at similar rates, and mismatched brightness is distracting to oncoming drivers.

What Bulbs Are Compatible with the 2019 Cadillac XT4?

Using the wrong bulb size can cause improper beam patterns that reduce your visibility and blind other drivers. It can also cause overheating inside the headlight housing, potentially warping the plastic lens or reflector. Always verify the bulb number before purchasing.

2019 Cadillac XT4 Headlight FAQ

The 2019 Cadillac XT4 uses a LED Headlights bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

The high beam bulb size for the 2019 Cadillac XT4 is LED Headlights.

The 2019 Cadillac XT4 uses a single bulb (dual filament) headlight system. This means one bulb controls both high and low beams.

Yes, the 2019 Cadillac XT4 comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a LED Headlights LED conversion kit for the low beams.

Yes, the 2019 Cadillac XT4 takes a LED Fog Light bulb for the fog light position.

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 LED Headlights 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.

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 LED Headlights LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

A pair of halogen LED Headlights bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. 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.

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 LED Headlights position are available as direct plug-and-play replacements.

Did Cadillac XT4 Bulb Sizes Change Over the Years?

We currently have bulb data for the 2019 Cadillac XT4. Check back as we expand our database with additional model years and trim-level variations.

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