Used for: Back Up Reverse Light Bulb
Used for: License Plate Light Bulb
Used for: License Plate Light Bulb
Used for: Dome Light Bulb
Used for: Trunk or Cargo Area Light
Used for: Trunk or Cargo Area Light
Used for: Vanity Mirror Light Bulb
This page helps you verify bulb sizes for the 2018 Cadillac XTS by lighting position, so you can match the correct bulb to the exact lamp location before ordering. It is a practical reference for owners who want to replace a failed bulb, upgrade lighting, or simply confirm what fits their car.
For the 2018 Cadillac XTS, many exterior lighting positions are listed as LED, while a few interior and utility bulbs use conventional part numbers. Because trim level, lighting package, market, and body style can affect fitment, it is always smart to confirm the bulb type for each specific location on your vehicle.
Fitment on the 2018 Cadillac XTS can vary by trim and package, especially when comparing factory LED equipment with other lighting setups. If your car has LED headlamps or LED exterior lamps, the replacement may be a module or assembly rather than a simple replaceable bulb, and aftermarket LED conversions may not behave the same as original equipment. Before buying anything, check the bulb already installed in the vehicle, compare the socket and connector style, and verify whether your XTS uses the same bulb on both sides or a different setup for a specific market or option package.
The bulb chart for the 2018 Cadillac XTS lists the low beam headlight as LED. Because the page does not provide a separate replaceable bulb number, you should verify the installed lighting hardware before ordering a replacement.
The high beam headlight is listed as LED on this page. That means the fitment may be tied to the headlamp assembly rather than a standard halogen-style bulb.
The back up reverse light bulb is listed as 921 for the 2018 Cadillac XTS. This is one of the few positions on the page with a specific replaceable bulb number.
The license plate light bulb is listed as 2825 or 98. Either bulb type may appear depending on the exact lamp setup, so checking the installed bulb is recommended before purchase.
The trunk or cargo area light is listed as 194 or 7441 for the 2018 Cadillac XTS. Both sizes appear on the page, so confirm which one matches your vehicle before ordering.
The vanity mirror light bulb is listed as 7065. If your mirror lamp is dim or burned out, compare the old bulb and socket before replacing it.
The dome light bulb is listed as 2886X, and it is marked as optional in the raw bulb list. That means some 2018 Cadillac XTS models or packages may differ.
The brake light bulb is listed as LED on this page. On many vehicles, that can mean the brake light is part of an LED assembly rather than a standard bulb you swap individually.
Both the front turn signal light bulb and rear turn signal light bulb are listed as LED. Because of that, replacement may depend on the exact lamp design and trim package.
Yes, the page lists both the parking light bulb and the daytime running light bulb as LED for the 2018 Cadillac XTS. Always confirm your specific lamp configuration before replacing parts.
Yes, both the front side marker light bulb and rear side marker light bulb are listed as LED. This helps when checking exterior lighting by position on the vehicle.
Because the 2018 Cadillac XTS can vary by trim, lighting package, market, and body style, the installed bulb is the best confirmation of fit. This is especially important for LED-equipped lamps and for positions where more than one bulb number is listed.
