Chevrolet Bolt EV Back Up Light Bulb Size

The Chevrolet Bolt EV back up light requires a bulb size of 921 for proper installation and function. Available data for the specified component covers the range from 2017 to 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	US Type	EU Type	Shop
2023	921	W16W	Check Price
2017-2021	921	W16W	Check Price

Bulb Specifications

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

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Additional Notes

The 921 is the sole backup light bulb size listed across all model years in the specifications, spanning 2017-2023 for the Chevrolet Bolt EV.
The 921 bulb follows the ANSI standard, which is the recognized specification body for lamp and lighting products in the United States and Canada.
The T15 designation refers to the bulb's tubular glass envelope, with the numeric portion indicating the width in eighths of an inch, making the T15 a relatively compact form factor within the wedge bulb family.
The wedge base design means the bulb is held in place by the tension of its base contacts rather than a bayonet or screw mechanism, a common construction in automotive reverse light applications.
The 921 operates at 12 volts and 16 watts, consistent with standard 12V automotive electrical systems found in passenger vehicles.
The 921 and 194 are both T-series wedge bulbs but are not interchangeable; the 194 operates at a lower wattage of 3.78W, making it unsuitable as a direct replacement for the 16W 921 in backup light positions.