What Size Bulbs Does a 2017 Cadillac XTS 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
$50 - $150 (HID System)
What Lighting System Does the 2017 Cadillac XTS Have?
The 2017 Cadillac XTS features an extensive lighting system with 13 bulb positions. It uses factory HID/Xenon technology with D3S projector headlights. The XTS has been available from 2013 to 2019, and the 2017 model falls in the mid-generation years.
Can You Put LED Bulbs in a 2017 Cadillac XTS?
The 2017 Cadillac XTS comes equipped with factory D3S HID/Xenon headlights. These already produce significantly more light than halogen bulbs, so upgrading is generally unnecessary. When your HID bulbs burn out, replace them with OEM-spec D3S HID bulbs to maintain the correct color temperature and beam pattern. Avoid cheap aftermarket HID bulbs as they can produce incorrect beam patterns and blind oncoming drivers. Your fog lights use a LED Fog Light halogen bulb, which can be upgraded to LED for a whiter color match with your HID headlights.
How to Replace Bulbs on a 2017 Cadillac XTS
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 2017 XTS, 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. HID headlights operate at high voltage. Always disconnect the battery before working on the headlight assembly. Never touch the HID ballast while the headlights are on, and handle the D3S capsule with gloves to avoid oil contamination. 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 13 Positions at Once
2017 Cadillac XTS Complete Bulb Size Chart
| Position | Bulb Size | Shop |
|---|---|---|
Low Beam | HID-D3S LED | Buy HID-D3S LED |
High Beam | HID-D3S LED | Buy HID-D3S LED |
Fog Light | LED Fog Light | Buy LED Fog Light |
Brake Light | LED Bulb | Buy LED Bulb |
Side Marker | LED Bulb | Buy LED Bulb |
Turn Signal Front | 7444NA LED | Buy 7444NA LED |
Turn Signal Rear | LED Bulb | Buy LED Bulb |
Dome Light | 2886X | Buy 2886X |
License Plate | 2825 | Buy 2825 |
Map Light | LED Bulb | Buy LED Bulb |
Parking Light | 7444NA | Buy 7444NA |
Reverse Light | 921 | Buy 921 |
Trunk Light | 175 | Buy 175 |
Want to upgrade everything at once?
Shop Complete LED Kit for 2017 Cadillac XTSHow Long Do 2017 Cadillac XTS Headlight Bulbs Last?
HID/Xenon headlights on the 2017 Cadillac XTS typically last 2,000 to 3,000 hours, or about 4 to 6 years of regular driving. As HID bulbs age, they shift color toward pink or purple, which is a clear sign that replacement is needed. Flickering on startup also indicates a worn bulb or failing ballast. At 9 years old, the original bulbs on your XTS are likely overdue for replacement. 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 2017 Cadillac XTS?
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.
2017 Cadillac XTS Headlight FAQ
Did Cadillac XTS Bulb Sizes Change Over the Years?
Over its production run from 2013 to 2019, the Cadillac XTS has seen bulb size changes in the Low Beam, High Beam and Turn Signal Front positions. The 2017 model uses the earlier bulb specification that was in place before the change around 2018. Always verify the exact bulb size for your specific 2017 model year using the chart above, as using the wrong size can result in poor fitment or reduced light output.
Other XTS Years
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Other Vehicles That Use HID-D3S LED Bulbs
These vehicles from other makes also use a HID-D3S LED low beam bulb: