Used for: Back Up Reverse Light Bulb
Used for: Trunk or Cargo Area Light
Used for: Trunk or Cargo Area Light
Used for: Vanity Mirror Light Bulb
This page covers the 2018 Cadillac CT6 and helps you verify bulb sizes by lighting position, so you can match the correct replacement to each lamp on the vehicle. Because Cadillac used different lighting setups depending on trim, market, and body style, it is important to check the exact function before ordering any bulb.
For the 2018 CT6, many exterior lighting positions use LED assemblies rather than replaceable standard bulbs, while a few interior and utility lamps still use conventional bulb types. Use the chart on this page to identify the correct bulb by location, including headlights, tail lights, turn signals, marker lights, license plate lights, and interior cargo or vanity lights.
Fitment can vary by trim package, lighting option, and whether the car has factory LED equipment or an aftermarket conversion. Some positions may be integrated LED modules instead of serviceable bulbs, and some replacement parts may differ between halogen-style and LED-equipped vehicles. Before buying, compare the installed bulb or lamp assembly to the listing on this page, and if possible remove the old bulb to confirm the base and size. This is especially helpful for items like the reverse light, trunk or cargo light, and vanity mirror light, where the exact fit can depend on equipment level and market.
The page shows LED for the headlight high beam and low beam, center high mount stop light, brake light, front turn signal, license plate light, parking light, tail light, daytime running light, rear turn signal, front side marker, and rear side marker. The back up reverse light is listed as 921, the trunk or cargo area light as 194 or 7441, and the vanity mirror light as 6612F.
On this page, the headlight high beam and low beam are listed as LED. That usually means the lighting is an LED setup rather than a simple halogen bulb swap, so the exact service part may be different from a standard bulb replacement.
Not always. Trim level, lighting package, market, and body style can change the fitment. Always confirm the exact lamp position on your car before ordering.
The back up reverse light bulb is listed as 921.
The trunk or cargo area light is listed as 194 or 7441. Either size may appear depending on the specific lamp setup.
The vanity mirror light bulb is listed as 6612F.
Yes, the chart lists brake light bulb and tail light bulb separately, and both are shown as LED. That means the functions are identified by position, even if the lamp design is integrated.
Sometimes, but fitment and performance can vary. Check the base type, physical size, and polarity requirements, and make sure the replacement is compatible with the CT6’s lighting system.
Look at the installed lamp assembly and compare it with the chart. If the vehicle has factory LED lighting, the bulb may be part of a sealed or integrated unit rather than a standard removable bulb.
Confirm whether you are replacing the front or rear position, since both are listed separately on this page. The 2018 CT6 uses LED for the front and rear side marker lights, as well as the front and rear turn signal lights.
The license plate light bulb is listed as LED. Depending on the lamp design, the replacement may be a bulb or an integrated LED module.
Because the 2018 Cadillac CT6 can have different lighting equipment depending on trim and package, the same model year may use different lamp designs. Verifying by position helps avoid ordering the wrong part.
