Hyundai Santa Cruz Back Up Light Bulb Size

The Hyundai Santa Cruz back up light requires bulb size P21W or 921 depending on the specific version. Data for the bulb sizes covers the range from 2022 to 2024.

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
2022	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 Santa Cruz uses two distinct back up light bulb types across its model years: the P21W for 2023-2024 and the 921 for 2022.
The P21W is an ECE-standard bulb used in European and worldwide automotive applications. It operates at 12V and draws 21W through a single filament, and it seats into a BA15s bayonet base.
The 921 is an ANSI-standard bulb common in North American automotive applications. It is a T15 wedge-type bulb operating at 12V and drawing 16W, and it requires no locking base to seat.
The BA15s bayonet base of the P21W and the wedge base of the 921 are physically incompatible with each other, meaning the two bulb types are not interchangeable despite both operating at 12V.
The P21W carries a higher wattage rating of 21W compared to the 921 at 16W, reflecting a difference in light output between the two standards.
The 2022 Santa Cruz back up light socket is designed for a wedge-type fitting, while the 2023-2024 socket is designed for a bayonet fitting, making cross-year bulb substitution incompatible without socket modification.