Hyundai Elantra GT Back Up Light Bulb Size

The Hyundai Elantra GT back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Available data covers the time range from 2013 through 2020 for the specified vehicle components.

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	US Type	EU Type	Shop
2019-2020	921 (With Halogen Capsule Headlamps)	W16W	Check Price
2013-2018	921	W16W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price

Other Locations

Additional Notes

The 921 bulb is the back up light specification across all listed model years of the Hyundai Elantra GT, spanning 2013-2020.
The 921 is a T15 wedge-base bulb rated at 12 volts and 16 watts, conforming to ANSI standards applicable in the United States and Canada.
The T15 designation refers to the bulb's tubular shape, with the numeric portion indicating its width in eighths of an inch, making it a relatively compact single-contact wedge type.
The wedge base design means the bulb is held in place by tension from the socket contacts rather than a bayonet or screw mechanism, which is a common trait in reverse light applications.
For the 2019-2020 Elantra GT, the 921 specification is noted specifically in conjunction with Halogen Capsule Headlamps, indicating a trim-level or package-dependent fitment condition for those years.
The 921 bulb shares its wedge base with several related bulb types in the same family, such as the 912 and 906, though those alternatives carry different wattage ratings and are not interchangeable without confirming socket and circuit compatibility.