Cadillac DeVille License Plate Bulb Size

The Cadillac DeVille license plate light uses bulb sizes PC168, 194, 97, and 67 depending on the specific production period for the vehicle. Available information covers the range of 1953 through 2005 for the specified automotive lighting components.

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
2000-2005	PC168
1978-1999	194
1977	97
1976	194
1975	97
1973-1974	194
1971-1972	97
1953-1970	67

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). 12V, 3.78W.	194
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67

Other Locations

Additional Notes

The Cadillac DeVille license plate position uses four distinct bulb types across its production span: the PC168, 194, 97, and 67, all of which conform to ANSI standards recognized in the United States and Canada.
The 194 bulb is the most frequently specified type across the DeVille range, covering model years 1978-1999 with isolated exceptions in 1972, 1974-1976, and 1977, as well as 1980-1999 without interruption.
The 67 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 8W. It serves as a lower-wattage variant of the 1156 bulb family and is specified for the DeVille from 1953 through 1970.
The 97 bulb shares the same BA15s bayonet base as the 67 but operates at a higher wattage of 13W. It is also classified as a variant of the 1156 family, and the DeVille used it in 1971, 1972, 1975, and 1977.
Because the 67 and 97 bulbs share the same BA15s bayonet base, they are physically interchangeable in terms of socket fitment, though their wattage ratings differ and substitution between them affects light output.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W. Its wedge base design means it is not socket-compatible with the BA15s bayonet base used by the 67 and 97 bulbs.
The PC168 is also a T10 miniature wedge bulb, but it features a printed circuit board twist-lock socket rather than a standard wedge socket. The Cadillac DeVille (2000-2005) uses this type for the license plate position.
The twist-lock socket of the PC168 makes it physically distinct from the standard 194 wedge, meaning the two T10-based bulbs are not directly interchangeable despite sharing the same general bulb form factor.
The transition from the 194 to the PC168 between the 1999 and 2000 model years reflects a socket design change in the DeVille, as both bulbs carry a T10 envelope but differ in their mounting interface.
The 97 bulb appearing in non-consecutive years alongside the 194 within the 1971-1977 range indicates that the DeVille did not use a single standardized license plate bulb type throughout that period.