Buick Encore GX Back Up Light Bulb Size

The Buick Encore GX back up light requires a bulb size of 921 for the specified lighting component. Data for the bulb size covers the range from 2020 to 2023.

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
2023	921
2020	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 bulb follows the ANSI standard used in the United States and Canada, making it a regionally standardized part rather than a globally universal one.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular shape with a width of 15 eighths of an inch across the widest point of the glass envelope.
The 921 operates at 12 volts and draws 16 watts, figures consistent with standard automotive electrical systems and typical reverse light output requirements.
The wedge base design of the 921 means the bulb is held in its socket by the tension of the base contacts alone, with no separate locking mechanism or bayonet pins involved in retention.
The Buick Encore GX uses the 921 bulb size for its back up light across the 2020 and 2023 model years.