Chevrolet Sprint Back Up Light Bulb Size

The Chevrolet Sprint back up light requires bulb size 1156 or P21W depending on the specific assembly installed in the vehicle. Data for the provided bulb sizes covers the range from 1985 to 1987.

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
1985-1987	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156

Other Locations

Additional Notes

The 1156 is the sole back up light bulb size listed for the Chevrolet Sprint across the 1985-1987 model years.
The 1156 is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a recognized North American standard used in both the United States and Canada.
The bulb operates on a 12-volt electrical system and draws 21 watts, which is typical of incandescent automotive reverse lighting applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the "s" denotes a single pin, distinguishing it from the dual-contact BA15d variant used in other applications.
As a single-filament bulb, the 1156 serves one dedicated function per socket, which is consistent with its use in a back up light circuit rather than a combined stop/tail application.
The BA15s base type is widely produced and found across many vehicle makes and lighting positions, though fitment to a specific socket depends on the housing design of the Sprint rather than base compatibility alone.