Chevrolet City Express Back Up Light Bulb Size

The Chevrolet City Express back up light requires a bulb size of 921 for the specific lighting component located at the rear of the vehicle. Data for the specified bulb covers the range from 2015 through 2018.

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
2015-2018	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 bulb is the specified back up light size for the Chevrolet City Express across the 2015-2018 model years.
The 921 is a wedge-type bulb, classified under the T15 designation, which refers to its tubular glass envelope size measured in eighths of an inch.
The wedge base design means the bulb is held in place by the socket itself rather than by pins or a bayonet mechanism, making it a tool-free removal type in most applications.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive electrical systems.
The 921 carries ANSI standardization recognized in both the United States and Canada, meaning the specification conforms to a defined performance and dimensional standard across those markets.
Because the 921 is an ANSI-standardized wedge bulb, other bulbs sharing the T15 wedge base and the same voltage and wattage rating are generally considered interchangeable, provided they meet the same ANSI designation.