Chevrolet Equinox Back Up Light Bulb Size

The Chevrolet Equinox back up light utilizes 921 and 922 bulb sizes for the rear illumination system. Available data covers the span of time from 2005 through 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	921
2021	922
2005-2020	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	922

Other Locations

Additional Notes

The 921 bulb is the dominant back up light specification for the Chevrolet Equinox, appearing across 2005-2020 and 2023-2024 model years.
Both the 921 and 922 are ANSI-standardized bulb types recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical standards rather than being proprietary specifications.
Both bulbs share the T15 wedge form factor, which refers to a tapering plastic base that wedges directly into a socket without requiring a separate locking mechanism or bayonet pins.
The 921 and 922 operate at 12 volts and 16 watts, placing them in the same electrical class for standard automotive low-voltage systems.
The 2021 Equinox is specified with the 922 bulb rather than the 921 used in surrounding model years, making it a notable fitment exception within the lineup.
Despite sharing the T15 wedge base, identical voltage, and identical wattage, the 921 and 922 carry distinct ANSI designations, which indicates a difference in their filament or envelope construction that may affect physical interchangeability.