Saturn SL2 Back Up Light Bulb Size

The Saturn SL2 back up light requires 1156, P21W, or 2057 bulb sizes depending on the specific version of the vehicle. Available data covers the range from 1991 to 2002.

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
1996-2002	1156
1991-1995	2057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057

Other Locations

Additional Notes

The Saturn SL2 back up light specifications cover model years 1991 through 2002, during which two distinct bulb sizes were used across the production run.
The 1156 bulb is specified for the Saturn SL2 (1996-2002), making it the fitment for the latter half of the model's production span covered in these specifications.
The 2057 bulb applies to the 1991-1995 model years, representing the earlier fitment used before the specification change.
The 1156 is a single-filament bulb operating at 12V and 21W, built on a BA15s bayonet base, which features a single locating pin on the base collar.
The 2057 is a dual-filament bulb operating at 12V with a high-filament draw of 26.9W and a low-filament draw of 8W, mounted on a BAY15d bayonet base with two offset locating pins.
The BAY15d base of the 2057 and the BA15s base of the 1156 are physically distinct, meaning the two bulb types are not interchangeable despite their similar appearance.
Both the 1156 and 2057 conform to ANSI standards recognized in the United States and Canada.
The 2057 is noted as a brighter variant of the 1157 bulb, sharing the dual-filament BAY15d base configuration common to that family of automotive bulbs.
Because the back up light circuit uses only a single on/off function, only one filament of the dual-filament 2057 is engaged in this application on 1991-1995 models.