Kia Niro EV Back Up Light Bulb Size

The Kia Niro EV back up light uses a P21W bulb size for this model. The replacement chart covers 2023 to 2024 vehicle production years with corresponding bulb size specifications.

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
2023-2024	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 the specified back up light bulb for the Kia Niro EV across the 2023-2024 model years.
The P21W follows the ECE (Economic Commission for Europe) standard, a regulatory framework used in Europe and numerous other markets worldwide.
This bulb operates on a 12-volt electrical system and draws 21 watts of power.
The P21W is a single-filament bulb, meaning it serves one lighting function rather than combining two functions within a single unit, as a dual-filament bulb would.
It uses a BA15s bayonet base, where "BA" denotes a bayonet cap fitting, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base.
The BA15s single-contact base is not interchangeable with the BA15d base, which carries two contacts and is found on dual-filament bulbs. Substituting one for the other is not possible without modification.