Chevrolet SS Back Up Light Bulb Size

The Chevrolet SS back up light utilizes a 921 bulb size for illumination purposes. Data for the specific component covers the period from 2014 through 2017.

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
2014-2017	921

Bulb Specifications

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

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Additional Notes

The Chevrolet SS uses the 921 bulb size for the back up light across the 2014-2017 model years.
The 921 is an ANSI-standardized bulb, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 921 bulb follows the T15 wedge form factor. A wedge bulb connects directly into its socket through friction contact on the base, without a separate metal cap or pins.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive electrical systems.
The T15 designation refers to the bulb's tubular shape, with the number indicating a width of 15 eighths of an inch across the glass envelope.
Because the 921 is a wedge-type bulb, it is not interchangeable with bayonet-base or pin-base bulb types, even when wattage or voltage ratings are similar.