Ford Transit Back Up Light Bulb Size

Ford Transit back up light bulbs utilize 3157 and 3057 sizes depending on model configuration. The replacement chart covers 2015 through 2023 production years with corresponding bulb size 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
2023	3157
2015-2020	3057

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

Other Locations

Additional Notes

The Ford Transit backup light specifications cover model years 2015-2023, with the 3057 bulb specified for 2015-2020 and the 3157 bulb specified for 2023.
Both the 3057 and 3157 are dual-filament wedge bulbs classified under the T25 form factor, meaning they share the same physical wedge base style and overall envelope size.
Each bulb operates at 12 volts and carries a 27W/7W dual-filament rating, where the higher wattage filament serves the primary function and the lower wattage filament serves a secondary function such as running or parking light duty.
Both bulbs conform to ANSI standards recognized in the United States and Canada, placing them within a regulated specification framework for electrical and photometric performance.
Despite their shared T25 form factor and identical voltage and wattage ratings, the 3057 and 3157 are distinct part numbers and are not confirmed as interchangeable across the Ford Transit model years listed in these specifications.
The change from the 3057 to the 3157 between the 2020 and 2023 Ford Transit indicates a fitment distinction that warrants attention when sourcing a replacement bulb for a specific model year.