Volvo WC Back Up Light Bulb Size

The Volvo WC back up light utilizes bulb size 1156 or P21W depending on the specific version of the component. Data for the lighting specifications covers the range from 1996 to 1998.

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
1996-1998	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the sole bulb type listed across all model years in these specifications for the Volvo WC back up light.
The 1156 follows the ANSI standard, making it a recognized specification in both the United States and Canada.
It is a single-filament bulb, meaning it serves one lighting function rather than switching between two brightness levels as a dual-filament bulb would.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb locks into the socket with a twist rather than a threaded connection.
The bulb operates at 12 volts and 21 watts, consistent with standard 12V automotive electrical systems.
The Volvo WC (1996-1998) takes the 1156 for its back up light position across all three listed model years, indicating consistent fitment within this production span.
The BA15s designation is a single-contact base, which is not interchangeable with the BA15d base used on dual-filament bulbs despite the two sharing a similar physical profile.