Jeep Wrangler Back Up Light Bulb Size

The Jeep Wrangler back up light utilizes unique bulb sizes 7440, 2458, 3157, P21W, and 1156 depending on the specific production version of the vehicle. Available information covers the range of 1987 through 2024 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
2024	7440
2019-2020	7440 (With Halogen Capsule Headlamps)
2018	3157 (With Halogen Capsule Headlamps)
2007-2017	3157
1997-2006	1156
1987-1995	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

Three distinct bulb sizes appear across the Jeep Wrangler back up light specifications: the 1156, 3157, and 7440, each representing a different socket type and filament configuration.
The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base. This base style uses a single pin offset to one side, which physically prevents incorrect installation.
The 3157 is a dual-filament wedge bulb (T25) rated at 12V with a 27W/7W output. Although it carries two filaments, only the 27W filament is relevant in a back up light application, as back up lights operate as single-intensity circuits.
The 7440 is a single-filament wedge bulb (T20) rated at 12V and 21W. It shares the same wattage as the 1156 but uses a wedge base rather than a bayonet base, making the two physically incompatible despite identical power ratings.
All three bulb sizes conform to ANSI standards applicable in the United States and Canada, meaning they follow standardized electrical and physical specifications within those markets.
The Jeep Wrangler used the 1156 for model years 1987-2006, making it the longest-running back up light bulb fitment across the specifications provided.
The 3157 replaced the 1156 starting with the 2007 model year and remained the specified size through 2018, with the 2018 and 2019-2020 entries noting applicability specifically to trims with Halogen Capsule Headlamps.
The 7440 is specified for the 2019-2020 model years under the Halogen Capsule Headlamps condition and again for 2024 without a trim qualifier, indicating a socket change relative to earlier generations.
The 3157 and 7440 both use wedge-style bases but are not interchangeable. The T25 socket of the 3157 is physically larger than the T20 socket of the 7440, and their pin configurations differ.
The 1156 bayonet base is incompatible with the wedge sockets used by the 3157 and 7440, meaning bulbs from the pre-2007 fitment cannot be substituted into 2007 and later applications.