Hyundai Kona Back Up Light Bulb Size

The Hyundai Kona back up light utilizes bulb sizes 921 and P21W for the rear illumination system. Data for the specific components covers the period from 2018 through 2024.

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
2024	921
2018-2023	P21W

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The Hyundai Kona uses two different backup light bulb types across its model years: the 921 and the P21W. These two bulbs are not interchangeable, as they differ in base type, wattage, and the regulatory standard they conform to.
The 921 is an ANSI-standard bulb used in North American markets. It follows a T15 wedge base design, operates at 12V, and draws 16W.
The P21W is an ECE-standard bulb common in European and international markets. It uses a BA15s bayonet base with a single filament, operates at 12V, and draws 21W.
The wedge base of the 921 and the BA15s bayonet base of the P21W are physically incompatible socket types, meaning one cannot be substituted for the other without modification to the socket.
The P21W draws 21W compared to the 921's 16W. This difference in power draw is relevant when considering replacement bulbs, as substituting a higher-wattage bulb into a circuit rated for a lower wattage can affect fuse and socket integrity.
The 2018-2023 Hyundai Kona specifies the P21W for the backup light position across all six model years in that range.
The 2024 Hyundai Kona specifies the 921 bulb, which represents a shift from the P21W used in prior model years and signals a difference in socket design between the 2024 model and earlier versions.