Mercedes-Benz G500 Back Up Light Bulb Size

The Mercedes-Benz G500 back up light utilizes a P21W bulb size for the rear illumination system. Data for the specified component covers the period from 2002 through 2008.

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
2002-2008	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 G500 uses the P21W bulb size for the back up light across the 2002-2008 model years.
The P21W is an ECE-standard bulb, meaning it conforms to the Economic Commission for Europe regulatory framework used in European and worldwide automotive lighting applications.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which is typical for single-filament signalling applications such as reverse lights.
The P21W uses a BA15s bayonet base, where "BA15" refers to the 15mm base width and "s" denotes a single contact at the base, distinguishing it from dual-contact variants.
Because the BA15s base is a single-contact design, it is not interchangeable with BA15d bulbs, which carry two contacts and are wired for dual-filament functions.