Dodge Grand Caravan Back Up Light Bulb Size

The Dodge Grand Caravan back up light utilizes bulb sizes 3157, 2458, 3057, 921, and 1156 depending on the specific version of the vehicle. Available data covers the range from 1987 through 2019 for the specified lighting components.

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
2008-2019	3157
1996-2007	3057
1991-1995	921
1987-1990	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
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 Grand Caravan backup light bulb specification covers model years 1987 through 2019 and includes four distinct bulb types across that span: the 3157, 3057, 921, and 1156.
The 3157 is the backup light bulb for the 2008-2019 Grand Caravan. It is a dual-filament T25 wedge bulb rated at 12V with a 27W high filament and a 7W low filament, conforming to ANSI standards for the US and Canada.
The 3057 serves the 1996-2007 Grand Caravan. It shares the same T25 wedge form factor, 12V operating voltage, and 27W/7W dual-filament rating as the 3157, making the two bulbs closely related in specification.
Although the 3157 and 3057 share identical wattage ratings and the same T25 wedge base, they are not the same part number and are not confirmed as interchangeable within these specifications. Substituting one for the other without verification of socket compatibility is not advised.
The 921 is specified for the 1991-1995 Grand Caravan. It is a single-filament T15 wedge bulb rated at 12V and 16W, which is a notably lower wattage than the dual-filament bulbs used in later model years.
The 1156 is specified for the 1987-1990 Grand Caravan. Unlike the wedge-base bulbs used in all other model years, the 1156 uses a BA15s bayonet base, meaning it requires a physically different socket and is not interchangeable with any of the other three bulb types listed.
All four bulb types conform to ANSI standards applicable in the US and Canada, indicating standardized electrical and physical tolerances across the full model year range.
The shift from the 1156 bayonet-base bulb to the 921 wedge-base bulb between the 1990 and 1991 Grand Caravan represents a change in both base type and bulb family, which affects socket compatibility at that boundary year.
The transition from the 921 to the 3057 between the 1995 and 1996 Grand Caravan involves a change from a T15 single-filament wedge to a T25 dual-filament wedge, meaning the two bulbs differ in both physical size and filament count.
The T25 designation shared by the 3157 and 3057 refers to a bulb body width of 25mm, while the T15 designation of the 921 refers to a 15mm body width, reflecting a meaningful size difference between those bulb families.