Mercedes-Benz GLC63 AMG Back Up Light Bulb Size

The Mercedes-Benz GLC63 AMG back up light requires a bulb size of 921 for proper installation and function within the rear lighting assembly. Available data for the specified bulb covers the range from 2018 through 2021.

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
2020-2021	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 back up light bulb size across all listed model years of the Mercedes-Benz GLC63 AMG, spanning 2018-2021.
The 921 follows the ANSI standard, which is the North American classification system used in the United States and Canada.
This bulb uses a wedge-style base, designated T15, which refers to a tubular glass envelope approximately 15 eighths of an inch wide that seats by friction rather than by a bayonet or screw mechanism.
The 921 operates at 12 volts and draws 16 watts, consistent with standard automotive low-power auxiliary lighting circuits.
The 2019 GLC63 AMG carries a fitment note specifying that the 921 size applies to vehicles equipped with Halogen Capsule Headlamps, indicating that headlamp type is a relevant variable for that model year.