Dodge Caravan Back Up Light Bulb Size

The Dodge Caravan back up light utilizes 3057, 921, 1156, and P21W bulb sizes depending on the specific version required for the vehicle. Available data covers a range from 1984 through 2007 for the components listed in the provided specifications.

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
1996-2007	3057
1993-1995	921
1984-1988	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The Dodge Caravan backup light specifications cover three distinct bulb types across the model's production history: the 3057, 921, and 1156.
The 3057 is the most widely specified bulb across this vehicle, covering the 1996-2007 model years of the Dodge Caravan backup light position.
The 3057 is a dual-filament wedge bulb in a T25 housing, rated at 12V with a 27W/7W output, and meets ANSI standards for the US and Canada.
Its dual-filament design means the 3057 carries two separate circuits within a single bulb, which is a notable fitment characteristic when sourcing a replacement.
The 921 bulb was specified for the 1993-1995 Dodge Caravan backup light, and it is a single-filament wedge type in a T15 housing rated at 12V and 16W.
The 1156 bulb was specified for the 1984-1988 Dodge Caravan backup light, and it uses a BA15s bayonet base rather than a wedge-style base, making it physically incompatible with sockets designed for wedge bulbs.
The BA15s bayonet base of the 1156 features a single contact pin, which distinguishes it from dual-pin bayonet variants and is a relevant detail for socket compatibility.
All three bulb types in these specifications are rated at 12V, consistent with standard automotive electrical systems, though their wattage ratings differ across the three types.
The transition from the 921 to the 3057 between the 1995 and 1996 model years represents a socket-type change, as both are wedge-style bulbs but with different housing sizes and filament configurations.
Because the 1156 uses a bayonet base while the 921 and 3057 use wedge bases, bulbs from the earlier 1984-1988 specification period are not interchangeable with those from later model years.