Cadillac CTS 2017 Bulb Size
Bulb size chart
The 2017 Cadillac CTS uses a mix of LED and replaceable bulb types, and the exact setup can vary by trim, lighting package, market, and body style. This page is designed to help you verify bulb sizes by lighting position, so you can match the correct bulb to the correct location before ordering replacements.
For this model year, the chart includes exterior lighting such as headlights, brake lights, turn signals, side markers, reverse lights, and license plate lights, along with interior bulbs for the dome, glove box, door, stepwell, vanity mirror, trunk, and map lights. Checking by position is the easiest way to avoid buying the wrong part.
Fitment on the 2017 Cadillac CTS can differ depending on whether the car came with factory LED lighting, a specific appearance package, or a regional configuration, so always compare the bulb listed for your exact position with what is installed on the vehicle. Some locations use LED modules rather than standard replaceable bulbs, while others use serviceable bulbs such as 921, D3S, 2825/98, 906, 2886X, 6612F, 211-2, or PC175. If you are considering an aftermarket LED conversion, make sure the bulb base, polarity, beam pattern, and heat management are suitable for the housing. Before purchasing, it is smart to remove the old bulb and confirm the markings on the bulb itself, since previous repairs or package differences can change what is actually in the car.
FAQ
What bulb does the 2017 Cadillac CTS use for the low beam and high beam headlights?
The chart lists D3S for both the high beam and low beam headlight bulb position on the 2017 Cadillac CTS.
Are the brake lights on the 2017 Cadillac CTS replaceable bulbs?
The brake light position is listed as LED, so it is not shown as a standard replaceable bulb in this chart.
What is the reverse light bulb size for a 2017 Cadillac CTS?
The back up reverse light bulb is listed as 921.
What bulb size is used for the license plate lights?
The license plate light bulb is listed as 2825, 98.
What bulb fits the dome light on this car?
The dome light bulb is listed as 2825, 98.
What bulb does the glove box light use?
The glove box light bulb is listed as 906.
What bulb fits the interior door light?
The interior door light bulb is listed as 906.
What is the trunk or cargo area light bulb size?
The trunk or cargo area light bulb is listed as 211-2.
What bulb is used for the map light?
The map light bulb is listed as PC175.
Do all 2017 Cadillac CTS trims use the same bulbs?
Not always. Trim level, lighting package, market, and body style can change the bulb setup, especially for exterior LED lighting and headlight configurations.
Can I swap the factory LED exterior lights to aftermarket bulbs?
Some exterior positions on the 2017 Cadillac CTS are listed as LED, so replacement options may involve modules or conversion parts rather than simple bulb swaps. Check compatibility carefully before changing them.
Should I verify the installed bulb before buying replacements?
Yes. The safest approach is to check the bulb currently installed in the vehicle and compare its base and markings with the chart, especially if the car has had prior repairs or aftermarket changes.
Which bulbs on the 2017 Cadillac CTS are commonly tied to interior lighting?
Interior positions listed on this page include the dome light, glove box light, interior door light, stepwell light, vanity mirror light, trunk or cargo area light, and map light.