Cadillac CTS-V 2018 Bulb Size
Bulb size chart
This page covers the 2018 Cadillac CTS-V bulb sizes by lighting position so you can quickly identify the correct replacement for each lamp on the car. Whether you are replacing an exterior bulb or a cabin light, the goal is to make fitment easier and help you avoid buying the wrong part.
The 2018 Cadillac CTS-V uses different bulb types depending on where the light is located, and some positions may vary by trim, market, or body style. Use the bulb chart on this page to verify the correct size for the headlight, reverse light, license plate light, and interior lighting before ordering.
For best results, compare the bulb listed for your lighting position with the bulb already installed in your vehicle, especially if your CTS-V has a different trim, lighting package, or has been modified with aftermarket parts. Some vehicles use halogen-style bulbs in certain locations while others may have LED assemblies or conversion kits that change the original fitment. If your car has been updated with aftermarket lighting, the factory bulb size may no longer match what is currently installed, so checking the old bulb before purchase is the safest way to confirm compatibility.
FAQ
What bulb size does the 2018 Cadillac CTS-V use for the headlights?
The headlight bulb size listed for the 2018 Cadillac CTS-V is D3S for both high beam and low beam applications.
What is the reverse light bulb size for this model year?
The back up reverse light bulb size listed for the 2018 Cadillac CTS-V is 921.
What bulb fits the license plate lights on a 2018 Cadillac CTS-V?
The license plate light bulb size listed for the 2018 Cadillac CTS-V is 2825.
What bulb size is used for the dome light?
The dome light bulb size listed for the 2018 Cadillac CTS-V is 2825.
What bulb fits the glove box light?
The glove box light bulb size listed for the 2018 Cadillac CTS-V is 906.
What bulb size is used in the interior door lights?
The interior door light bulb size listed for the 2018 Cadillac CTS-V is 906.
What bulb size fits the stepwell lights?
The stepwell light bulb size listed for the 2018 Cadillac CTS-V is 2886X.
What bulb size is used for the vanity mirror lights?
The vanity mirror light bulb size listed for the 2018 Cadillac CTS-V is 6612F.
What bulb fits the trunk or cargo area light?
The trunk or cargo area light bulb size listed for the 2018 Cadillac CTS-V is 211-2.
What bulb size is used for the map lights?
The map light bulb size listed for the 2018 Cadillac CTS-V is PC175.
Do all 2018 Cadillac CTS-V models use the same bulb sizes?
Not always. Trim, lighting package, market, and body style can affect bulb fitment, so it is important to confirm the exact lighting position on your vehicle.
Should I replace bulbs in pairs on the 2018 CTS-V?
For headlights and other matched lighting positions, replacing bulbs in pairs is often a good idea so brightness and color stay consistent from side to side.
Can I use LED replacements in place of the factory bulbs?
LED replacements may fit in some positions, but compatibility depends on the housing, connector, and vehicle electronics. Always confirm that the LED matches the required bulb size and works properly in your CTS-V.
How can I make sure I buy the correct bulb?
Use the bulb chart for the specific lighting position and compare it with the bulb currently installed in your car before ordering. This is especially important if the vehicle has been modified or if the lighting package differs from the original factory setup.