Chevrolet P60 Back Up Light Bulb Size

The Chevrolet P60 back up light requires a bulb size of 1156 for the rear lighting system. Data for the specified component covers the range from 1983 through 1988.

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
1983-1988	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 Chevrolet P60 uses the 1156 bulb for the back up light across the 1983-1988 model years.
The 1156 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
The 1156 is a single-filament bulb, which means it serves one lighting function only, as opposed to dual-filament bulbs that handle two functions such as braking and running light simultaneously.
The bulb operates on a 12-volt electrical system at 21 watts, consistent with standard automotive low-voltage architecture.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a bayonet cap with a 15mm base width and a single contact pin, distinguishing it from the visually similar BA15d, which carries two contact pins for dual-filament use.
The single-contact BA15s base of the 1156 is not interchangeable with dual-contact bayonet bases. Substituting a dual-filament bulb with a BA15d base into a BA15s socket is not a compatible fitment.