Cadillac CTS 2006 Bulb Size
Bulb size chart
This 2006 Cadillac CTS bulb size page helps you verify the correct bulbs by lighting position before you buy replacements. Whether you are changing a headlight, a tail light, or a small interior lamp, matching the bulb to the exact location is the easiest way to avoid fitment mistakes.
The 2006 Cadillac CTS used different bulb types depending on the lamp position, and some setups also vary by trim, lighting package, market, and body style. Use this page as a quick reference for the most common exterior and interior bulbs on the CTS, including low beam, high beam, brake, reverse, license plate, and cabin lights.
For best results, compare the bulb listed here with the one already installed in your car before ordering, especially if your CTS has optional HID headlights or a different lighting package. Halogen and LED replacements can look similar but may not fit or function the same way, and some aftermarket LED conversions need extra parts or may not be road-legal in every area. If your vehicle has been modified, or if a previous owner changed a lamp assembly, the installed bulb may differ from the original factory specification. Checking the old bulb, the socket, and the housing before purchase is the safest way to confirm fitment.
FAQ
What bulb does a 2006 Cadillac CTS use for the low beam headlights?
The low beam bulb depends on the headlight type. 2006 Cadillac CTS models with HID headlights use D1S low beam bulbs, while models with halogen headlights use 9006XS low beam bulbs.
What is the high beam bulb for the 2006 Cadillac CTS?
The high beam bulb is 9005XS.
Which bulb fits the front outer turn signal on a 2006 Cadillac CTS?
The front outer turn signal bulb is 2825, 98.
Which bulb fits the front inner turn signal on this CTS?
The front inner turn signal bulb is 3157.
What bulb is used for the brake lights?
The brake light bulb is 3157R.
What bulb does the rear tail light use?
The tail light bulb is 3157R.
What bulb is used for the rear turn signal?
The rear turn signal bulb is 3157.
What bulb fits the reverse lights on a 2006 Cadillac CTS?
The back up reverse light bulb is 3157.
What bulb is used for the daytime running lights?
The daytime running light bulb is 3157.
What bulb fits the front side marker light?
The front side marker light bulb is 194NA.
What bulb fits the rear side marker light?
The rear side marker light bulb is 2825, 98.
What bulb is used for the license plate lights?
The license plate light bulb is 2825, 98.
What bulb fits the trunk or cargo area light?
The trunk or cargo area light bulb is 211-2.
What bulb is used for the center high mount stop light?
The center high mount stop light bulb is PC175.
What bulb fits the dome light and map light?
Both the dome light and map light use PC175 bulbs.
What bulb is used for the courtesy light?
The courtesy light bulb is 564.
Can trim or market differences change the bulb size on a 2006 Cadillac CTS?
Yes. Trim level, lighting package, market, and body style can affect the exact bulb setup, so it is smart to confirm the installed bulb before buying replacements.
Can I replace the factory bulbs with LED bulbs on this CTS?
Yes, many positions can be upgraded to LED, but fitment and performance can vary. Some LED bulbs may need resistors, adapters, or CAN-bus compatible designs to work correctly without warnings or hyperflash.
How can I tell if my CTS has HID or halogen low beams?
Check the headlight assembly and the bulb already installed. HID-equipped cars use D1S low beam bulbs, while halogen-equipped cars use 9006XS low beam bulbs.
Should I rely only on the bulb chart when ordering parts?
Use the chart as a guide, but always verify the bulb in the vehicle when possible. This is especially important if the car has been modified or if the lamp assembly was replaced in the past.