Cadillac CTS 2019 Bulb Size
Bulb size chart
The 2019 Cadillac CTS uses a mix of LED and replaceable bulb types across the exterior and interior lighting system. This page is designed to help you verify bulb sizes by lighting position, so you can match the correct bulb to the headlight, tail light, reverse light, license plate light, dome light, and other locations without guessing.
Because Cadillac used different lighting setups depending on trim, body style, and market, the exact bulb fitment can vary. Use the bulb chart for the 2019 Cadillac CTS as a position-by-position reference before ordering replacement bulbs or planning an LED upgrade.
For best fitment results, compare the bulb chart with the bulbs already installed in your vehicle, especially if your CTS has a premium lighting package or has been modified before. Some positions on this model are LED assemblies rather than simple replaceable bulbs, while others use standard service bulbs such as 921, D3S, 2825, 98, 906, 2886X, 6612F, 211-2, and PC175 depending on location. If you are converting from halogen to LED aftermarket bulbs, check beam pattern, polarity, and warning-light compatibility before buying. The safest approach is to confirm the installed bulb type first, then choose a replacement that matches the original socket and lighting function.
FAQ
What bulb size does the 2019 Cadillac CTS use for the low and high beam headlights?
The 2019 Cadillac CTS uses D3S bulbs for both the high beam and low beam headlight function listed on this page.
What is the reverse light bulb size on a 2019 Cadillac CTS?
The back up reverse light bulb listed for the 2019 Cadillac CTS is 921.
Are the brake lights on the 2019 Cadillac CTS replaceable bulbs?
The brake light bulb is listed as LED, so this position is not shown as a standard replaceable halogen bulb on this page.
What bulb does the license plate light use on the 2019 Cadillac CTS?
The license plate light bulb is listed as 2825, 98 for the 2019 Cadillac CTS.
What size is the dome light bulb on this model year?
The dome light bulb is listed as 2825, 98 for the 2019 Cadillac CTS.
What bulb size is used for the glove box light?
The glove box light bulb is listed as 906.
What bulb size is used for the interior door light?
The interior door light bulb is listed as 906.
What bulb size is used for the stepwell light?
The stepwell light bulb is listed as 2886X.
What bulb size is used for the vanity mirror light?
The vanity mirror light bulb is listed as 6612F.
What bulb size is used for the trunk or cargo area light?
The trunk or cargo area light bulb is listed as 211-2.
What bulb size is used for the map light?
The map light bulb is listed as PC175.
Do the exterior signal and marker lights use standard bulbs on the 2019 Cadillac CTS?
Several exterior lighting positions on the 2019 Cadillac CTS are listed as LED, including the front turn signal, rear turn signal, side marker lights, tail light, daytime running light, center high mount stop light, and brake light.
Why should I check the installed bulb before ordering replacements?
Trim and lighting package differences can affect fitment, and some 2019 Cadillac CTS vehicles may have different lighting hardware by market or body style. Checking the installed bulb helps avoid ordering the wrong part.
Can I switch the 2019 Cadillac CTS to LED bulbs in every position?
Not every position is a simple bulb swap. Some locations are already LED assemblies, while others use service bulbs. If you plan an aftermarket LED conversion, verify socket type, size, and compatibility before purchase.