Mercedes-Benz GLC350e Back Up Light Bulb Size

The Mercedes-Benz GLC350e back up light requires a bulb size of 921 for the rear lighting assembly. Data for the specified component covers the range from 2018 to 2020.

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
2020	921
2019	921 (With Halogen Capsule Headlamps)
2018	921

Bulb Specifications

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

Other Locations

Additional Notes

The 921 bulb is the specified back up light bulb size for the Mercedes-Benz GLC350e across the 2018-2020 model years.
The 921 is an ANSI-standardized bulb type, meaning its physical and electrical characteristics conform to a defined North American specification used in both the United States and Canada.
The 921 uses a wedge-style base, designated T15, which refers to a tubular bulb body approximately 15 eighths of an inch wide that is held in its socket by the tension of the base contacts rather than a bayonet or screw mechanism.
The bulb operates at 12 volts and draws 16 watts, which is consistent with standard automotive low-current incandescent applications.
The 2019 GLC350e carries a fitment note specifying the 921 bulb size applies to vehicles equipped with Halogen Capsule Headlamps, indicating that headlamp configuration is a relevant variable for that model year.