Volvo VN Dome Light Bulb Size

The Volvo VN dome light requires a P21W bulb size for proper illumination within the interior cabin area. Data provided for the bulb specifications covers the range from 1998 to 2004.

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
2004	P21W
1998-1999	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 P21W is the sole bulb type listed across all specified model years of the Volvo VN, covering 1998, 1999, and 2004.
The P21W is an ECE-standardized bulb, meaning it conforms to the Economic Commission for Europe's lighting regulations, which are recognized across European and worldwide markets.
This bulb operates on a 12-volt electrical system and draws 21 watts, placing it in the mid-range of standard automotive signalling bulb wattages.
The P21W uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single central contact pin at the base, as opposed to the dual-contact BA15d variant.
Because the BA15s base is a single-contact design, it is not interchangeable with dual-contact BA15d bulbs, even though the physical bayonet collar size is the same.
The P21W is a single-filament bulb, which distinguishes it from dual-filament variants such as the P21/5W, and this difference affects fitment compatibility despite a shared base type in some housings.