Hyundai Ioniq front turn signal uses 2357NA bulb size while rear turn signal requires 1156NA bulb size. The replacement bulb size chart covers 2017 to 2020 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Hyundai Ioniq uses two distinct turn signal bulb types across its front and rear positions for the 2017-2020 model years: the 2357NA at the front and the 1156NA at the rear.
The 2357NA is a dual-filament bulb rated at 12V with a power draw of 26.9W on its primary filament and 8W on its secondary filament, housed in a BAY15d bayonet base with natural amber glass.
The 1156NA is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base and natural amber glass, making it electrically and physically distinct from the 2357NA used at the front.
Both bulb types carry ANSI standardization applicable to the US and Canadian markets, meaning their electrical and physical specifications conform to a defined North American standard.
The BAY15d base of the 2357NA and the BA15s base of the 1156NA are not interchangeable. The BAY15d features offset locking pins to accommodate its dual-filament design, while the BA15s uses a single-pin configuration suited to a single-filament bulb.
The natural amber glass designation on both bulb types indicates that the amber color is produced by the glass envelope itself rather than by a painted or coated lens, which is a factor in light output consistency over the bulb's service life.
The rear turn signal specification for the Hyundai Ioniq (2017-2020) applies specifically to vehicles equipped with halogen capsule headlamps, indicating that headlamp type is a relevant variable in rear turn signal fitment.