Ram ProMaster City Back Up Light Bulb Size

The Ram ProMaster City back up light requires a 921 bulb size for proper installation and function within the rear lighting assembly. Data provided for the specific component covers the production range from 2015 through 2022.

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
2015-2022	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 is the back up light bulb size specified for the Ram ProMaster City across all listed model years, 2015-2022.
The 921 bulb follows the ANSI standard recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across North American markets.
The 921 uses a wedge-style base, designated T15, which refers to a tubular bulb body approximately 15 eighths of an inch wide. The wedge base design relies on the bulb's own glass envelope to make contact with the socket, with no separate metal base or pins involved.
The 921 operates at 12 volts and draws 16 watts, figures consistent with standard automotive single-filament incandescent bulbs used in reverse light applications.
Because the 921 is an ANSI-standardized wedge bulb, it is physically interchangeable with other bulbs sharing the T15 wedge form factor and the same voltage rating, provided the wattage and socket depth are compatible with the vehicle's housing and wiring.