Buick Cascada Back Up Light Bulb Size

The Buick Cascada back up light utilizes a 921 bulb size for illumination purposes. Data for the specific component covers the period from 2016 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	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Buick Cascada uses the 921 bulb size for the back up light across all available model years, spanning 2016-2019.
The 921 bulb follows the ANSI standard, which is the recognized specification system for automotive lighting in the United States and Canada.
This bulb uses a wedge-style base, designated T15, which refers to a tubular glass envelope roughly 15/8 of an inch wide. The wedge base connects directly into the socket without a separate metal base, relying on the glass pinch at the bottom to hold it in place.
The 921 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
The bulb carries a 16-watt power rating, which reflects the amount of electrical energy it consumes during operation.
Because the 921 is an ANSI-standardized bulb, units from different manufacturers sharing that designation are expected to conform to the same electrical and physical specifications, which generally allows for interchangeability between brands within that standard.