Ford Five Hundred Back Up Light Bulb Size

The Ford Five Hundred back up light requires bulb size 3156 or 2356 depending on the specific version of the component. Data for the provided specifications covers the range from 2005 to 2007.

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
2006-2007	3156
2005	2356

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2356

Other Locations

Additional Notes

The Ford Five Hundred uses two distinct bulb types across its model years for the back up light position: the 3156 and the 2356.
The 3156 is an ANSI-standardized bulb used in the US and Canada, built on a T25 wedge base with a single filament, rated at 12V and 27W.
The 2356 is also an ANSI-standardized bulb for the US and Canadian market, but it carries a dual-filament design mounted on a BAY15d bayonet base, operating at 12V.
The BAY15d bayonet base of the 2356 and the T25 wedge base of the 3156 are physically incompatible, meaning the two bulb types are not interchangeable despite sharing the same 12V operating voltage.
The dual-filament construction of the 2356 distinguishes it functionally from the single-filament 3156, as each filament in a dual-filament bulb typically serves a separate lighting function at a different wattage.
The Ford Five Hundred (2006-2007) takes the 3156 bulb for the back up light, while the 2005 model year requires the 2356.
Because the 2005 Ford Five Hundred uses a bayonet-base bulb and the 2006-2007 models use a wedge-base bulb, the socket housing in the vehicle changed between the 2005 and 2006 model years, making cross-year bulb substitution physically impossible without modification.