Volvo V90 Cross Country Back Up Light Bulb Size

The Volvo V90 Cross Country back up light requires a bulb with the H21W size specification. Data for the bulb size covers the range from 2017 to 2024.

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
2021-2024	H21W
2017-2019	H21W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W

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Additional Notes

The Volvo V90 Cross Country uses the H21W bulb for its back up light across all listed model years from 2017-2024.
The H21W is an ECE-standard bulb, meaning it conforms to European and international automotive lighting regulations rather than SAE standards used in North America.
H21W 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 H21W uses a BAY9s base, which is an offset bayonet mount. The asymmetrical pin placement of the BAY9s base prevents incorrect installation orientation.
Because the H21W carries a BAY9s base, it is not interchangeable with more common bayonet-base bulbs such as the 1156 (BA15s) or 7506, despite those sharing a similar wattage rating.
The single-filament design of the H21W means it serves one lighting function only, distinguishing it from dual-filament bulbs that handle two functions such as braking and running light duties simultaneously.