Cadillac CTS Map Light Bulb Size

The Cadillac CTS map light utilizes PC168 and PC175 bulb sizes for the interior lighting components. Available data covers the specific time range from 2003 through 2019 for the specified vehicle.

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	PC168
2006-2013	PC168
2005	PC175
2004	PC168
2003	PC175

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10) with printed circuit board twist-lock socket, for instrument clusters. 12V.	PC168
ANSI standard (US & Canada). Miniature wedge bulb (T10) with printed circuit board twist-lock socket, for instrument clusters. 12V.	PC175

Other Locations

Additional Notes

The Cadillac CTS map light uses the PC168 bulb across the majority of its model years, specifically 2004 and 2006-2013, as well as 2016-2019.
The PC168 is an ANSI-standardized miniature wedge bulb classified under the T10 form factor, fitted with a printed circuit board twist-lock socket and rated at 12 volts.
The PC175 is also an ANSI-standardized T10 miniature wedge bulb with a printed circuit board twist-lock socket rated at 12 volts, sharing the same general form factor as the PC168.
Despite their physical similarities, the PC168 and PC175 are distinct part numbers, and their use in the Cadillac CTS is not interchangeable across all model years.
The 2003 and 2005 Cadillac CTS map light positions call for the PC175 rather than the PC168, making those two years the exception within the broader CTS model range covered by these specifications.
The printed circuit board twist-lock socket design on both bulb types requires a rotational installation method, distinguishing them from standard push-in wedge bulbs of the same T10 size.
Both the PC168 and PC175 carry ANSI standardization applicable to the United States and Canada, indicating conformance to a defined set of electrical and physical tolerances for those markets.
The T10 wedge classification shared by both bulb types refers to a tubular bulb body approximately 10 millimeters wide at its widest point, a common sizing used in low-current interior lighting applications.