Chevrolet Captiva Sport Back Up Light Bulb Size

The Chevrolet Captiva Sport back up light utilizes 921 and 3157 bulb sizes for replacement applications. The replacement chart covers 2012 through 2015 vehicle 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
2013-2015	921
2012	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The Chevrolet Captiva Sport uses two different back up light bulb sizes across its production run, with the 921 fitted to 2013-2015 models and the 3157 fitted to the 2012 model.
The 921 is a single-filament wedge bulb classified under the T15 designation, operating at 12 volts and drawing 16 watts.
The 3157 is a dual-filament wedge bulb classified under the T25 designation, operating at 12 volts with a filament rating of 27 watts on the high filament and 7 watts on the low filament.
Both bulb types conform to ANSI standards applicable in the United States and Canada.
The dual-filament construction of the 3157 means it carries two separate circuits within a single bulb, which is a fundamentally different internal configuration from the single-filament 921.
The wattage difference between the two bulbs is significant: the 3157 high filament draws 27 watts compared to the 921's 16 watts, meaning the two bulbs are not interchangeable despite both using a wedge-style base.
The T15 and T25 designations refer to the tubular envelope size of each bulb, with T25 being physically larger than T15, which further affects socket fitment between the 2012 and 2013-2015 model years.