Genesis G70 Back Up Light Bulb Size

The Genesis G70 back up light requires a bulb size of 921 for proper installation and function. Data for the specified lighting component covers the range from 2019 to 2021.

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	921
2019	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

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Additional Notes

The 921 bulb is the specified size for the Genesis G70 backup light across the 2019 and 2021 model years.
The 921 bulb follows the ANSI standard recognized in the United States and Canada, operating at 12 volts with a 16-watt output.
The 921 uses a wedge-style base, designated T15, which refers to the tubular glass envelope width measured in eighths of an inch, placing it at approximately 15/8 inches wide.
Wedge-base bulbs like the 921 are retained by the socket through friction rather than a bayonet or screw mechanism, meaning the base itself acts as the electrical contact and mounting point.
The T15 wedge format is shared across a wide range of automotive applications, which means physically similar bulbs from other product families may fit the socket without meeting the 921 electrical rating of 16 watts at 12 volts.
A bulb that fits the T15 wedge socket but carries a different wattage rating would not conform to the Genesis G70 specification, as the 921 designation defines both the physical form and the electrical characteristics together.