Kia Forte Daytime Running Light Bulb Size

The Kia Forte daytime running light requires bulb size 2357 or P21/5W depending on the specific configuration. Data for the bulb sizes covers the range from 2021 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	2357
2021	P21/5W

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2357
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

Other Locations

Additional Notes

The 2357 bulb follows the ANSI standard used in the United States and Canada, while the P21/5W follows the ECE standard used in Europe and other markets. Both share the BAY15d bayonet base, which is a dual-contact offset-pin base designed to prevent incorrect insertion.
Both bulbs are dual-filament types, meaning each contains a high-intensity filament and a lower-intensity filament within a single housing. This allows one bulb to serve two lighting functions simultaneously.
The 2357 operates at 26.9W on its primary filament and 8W on its secondary filament. The P21/5W operates at 21W on its primary filament and 5W on its secondary filament. The 2357 draws more wattage on both filaments than the P21/5W.
Both bulbs operate at 12 volts, which is consistent with standard automotive electrical systems.
The 2357 is a brighter variant of the 1157 bulb. While the 1157 is one of the most widely used dual-filament bulbs in North American vehicles, the 2357 produces higher light output from its primary filament.
The Kia Forte uses the 2357 for the 2023 model year and the P21/5W for the 2021 model year. Although both bulbs share the BAY15d base, their differing wattage ratings mean they are not direct electrical equivalents and should not be treated as interchangeable.