Hyundai Tucson Back Up Light Bulb Size

The Hyundai Tucson back up light utilizes bulb size 921 and bulb size P21W for illumination. Data for the specific components covers the time range from 2005 through 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
2021-2023	P21W
2005-2019	921

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Hyundai Tucson backup light specifications cover model years 2005 through 2023, with two distinct bulb types used across that span.
The 921 bulb is specified for the 2005-2019 model years, making it the fitment used across the majority of Tucson production covered in these specifications.
The 921 follows the ANSI standard and is a T15 wedge-base bulb rated at 12V and 16W, commonly associated with the North American market.
The P21W is specified for the 2021-2023 Hyundai Tucson backup lights, representing a change from the wedge-base format used in prior years.
The P21W follows the ECE standard, which is used in Europe and internationally. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The BA15s bayonet base of the P21W and the wedge base of the 921 are physically incompatible, meaning the two bulb types are not interchangeable without a socket adapter.
The P21W carries a higher wattage rating of 21W compared to the 921 at 16W, reflecting a difference in power draw between the two standards.
No backup light bulb size is listed for the 2020 model year in these specifications.