Volvo C30 Back Up Light Bulb Size

The Volvo C30 back up light utilizes a P21W bulb size for illumination during reverse maneuvers. Data for the specified lighting component covers the range from 2008 through 2013.

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
2008-2013	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 Volvo C30 uses the P21W bulb across all model years in the specification, spanning 2008-2013.
The P21W is an ECE-standard bulb, meaning it conforms to the United Nations Economic Commission for Europe regulations, which govern lighting equipment used in Europe and many other markets worldwide.
P21W bulbs operate on a 12-volt electrical system and draw 21 watts, which is the standard power rating for single-filament signalling applications.
The P21W uses a BA15s bayonet base, where "BA" denotes a bayonet cap fitting, "15" refers to the 15mm base width, and the lowercase "s" indicates a single contact at the base.
Because the P21W is a single-filament bulb, it serves one lighting function only, which in this case is the backup light.
The BA15s single-contact base is not interchangeable with the BA15d base, which carries two contacts and is found on dual-filament bulbs. Substituting one for the other is not possible without a base adapter.
The ECE designation on the P21W distinguishes it from SAE-standard bulbs used in North American markets. While some P21W bulbs are cross-compatible with SAE equivalents such as the 1156, minor differences in base pin placement and light output certification may affect fitment or legal compliance depending on the market.