Volvo XC40 Brake Bulb Size

The Volvo XC40 brake light requires a specific H21W bulb size for proper installation and function within the lighting assembly. Data for the specified component covers the range from 2019 to 2023.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Brake

Years	Bulb Type	Shop
2023	H21W	Check Price
2019-2020	H21W	Check Price

Inner Brake

Years	Bulb Type	Shop
2021-2022	H21W	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament signalling bulb with BAY9s base. 12V, 21W.	H21W	Check Price

Other Locations

Additional Notes

The H21W is the bulb type specified across all listed brake light positions on the Volvo XC40, making it the sole bulb type present in these specifications.
The H21W operates at 12 volts with a 21-watt output and uses a single filament, classifying it as a dedicated signalling bulb rather than a dual-function lighting unit.
The H21W is built to the ECE standard, a regulatory framework recognized across Europe and numerous other markets worldwide, governing performance and safety requirements for automotive lighting.
The H21W uses a BAY9s bayonet base, a offset-pin bayonet fitting that is not interchangeable with the more common BA15s or BAY15d bases found on other automotive bulbs, making base compatibility a relevant consideration during replacement.
The standard brake bulb position on the Volvo XC40 carries the H21W specification for the 2019-2020 and 2023 model years.
The Inner Brake position on the Volvo XC40 carries the H21W specification for the 2021-2022 model years.