Cadillac CTS Interior Door Bulb Size

The Cadillac CTS interior door utilizes a 906 bulb size for illumination purposes within the vehicle cabin. Available data covers a span of time starting from 2008 through 2019.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2016-2019	906
2008-2013	906

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906

Other Locations

Additional Notes

The 906 bulb is the interior door bulb size specified for the Cadillac CTS across all listed model years.
The 906 designation follows ANSI standards, meaning it conforms to a standardized specification recognized in both the United States and Canada.
This bulb belongs to the T10 miniature wedge form factor, which uses a wedge-shaped base rather than a pin or bayonet mount, allowing it to be inserted directly into a compatible socket without rotation.
The 906 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
At 8 watts, the 906 draws a relatively low amount of power, which is typical for interior courtesy lighting applications.
The specifications cover model years 2008-2013 and 2016-2019, with the 906 bulb size remaining consistent across both of those ranges.
The T10 wedge base is a widely used form factor, meaning 906 bulbs are generally available from multiple manufacturers, though the specified voltage and wattage ratings should be matched when selecting a replacement.
Because the 906 is an ANSI-standardized bulb, it carries a defined set of electrical and physical characteristics that must be met for a bulb to carry that designation, which supports cross-brand interchangeability within the same standard.