Hyundai Elantra N Brake Bulb Size

The Hyundai Elantra N uses a P21W bulb size for the Center High Mount Stop Light replacement. The chart covers 2023 to 2024 production years with corresponding bulb size data.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Center High Mount Stop Light

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

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Additional Notes

The P21W is the bulb type specified for the Center High Mount Stop Light on the Hyundai Elantra N across the 2023-2024 model years.
The P21W operates on a 12-volt electrical system and draws 21 watts, which are standard values for single-filament stop and signal applications in automotive lighting.
As a single-filament bulb, the P21W serves one lighting function only, making it distinct from dual-filament types that handle two functions such as running light and brake light within a single unit.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin offset, which physically prevents incorrect installation of incompatible base types.
The P21W is governed by ECE regulations, a standard recognized across Europe and numerous other markets worldwide, meaning the bulb's output and construction conform to internationally defined performance criteria.
The BA15s base is not interchangeable with the BA15d base, which carries two contact pins. Substituting one for the other is not possible without modification to the socket.