Mercedes-Benz G63 AMG Back Up Light Bulb Size

The Mercedes-Benz G63 AMG back up light utilizes a P21W bulb size for illumination. Data for the specified component covers the range from 2013 to 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	Bulb Size
2013-2018	P21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W

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Additional Notes

The Mercedes-Benz G63 AMG uses the P21W bulb for its back up light across the 2013-2018 model years.
The P21W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe's lighting regulations, which are widely adopted across European and international markets.
This bulb operates on a 12-volt electrical system and draws 21 watts, which is typical for single-filament incandescent signalling applications.
The P21W carries a BA15s bayonet base, where "BA" denotes a bayonet-style mount, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base.
Because the BA15s base has a single contact, the P21W is not interchangeable with visually similar bulbs that use a BA15d (dual-contact) base, even if the physical size appears close.
The single-filament design of the P21W means it serves one lighting function only, distinguishing it from dual-filament bulbs that handle two functions such as braking and running light simultaneously.