Hyundai Kona Electric Back Up Light Bulb Size

The Hyundai Kona Electric back up light requires a bulb size of P21W for the rear lighting assembly. Data for the specified component covers the range from 2019 to 2020.

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
2019-2020	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

Other Locations

Additional Notes

The P21W is an ECE-standardized single-filament signalling bulb rated at 12 volts and 21 watts, fitted with a BA15s bayonet base. The BA15s designation indicates a single-contact bayonet cap with a 15mm base width.
The Hyundai Kona Electric uses the P21W bulb for the backup light position across the 2019-2020 model years.
The BA15s base is a single-contact type, which is not interchangeable with the BA15d double-contact bayonet base despite sharing the same 15mm base width. Substituting a BA15d bulb into a BA15s socket is not possible without modification.
The P21W operates on a 12-volt electrical system, consistent with standard automotive low-voltage architecture. Its 21-watt rating places it in the mid-range of single-filament signalling bulbs.