Volvo V50 Back Up Light Bulb Size

The Volvo V50 back up light utilizes a P21W bulb size for illumination purposes. Data for the specified lighting component covers the range from 2005 to 2011.

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
2005-2011	P21W

Bulb Specifications

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

Other Locations

Additional Notes

The Volvo V50 uses the P21W bulb for the back up light across all listed model years, spanning 2005-2011.
The P21W is an ECE-standardized 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 incandescent signalling applications.
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 the BA15d base, which carries two contacts and is used in dual-filament bulbs.
The single-filament construction of the P21W means it is dedicated to one lighting function per socket, which is consistent with its use in a back up light rather than a combined stop and tail application.