Pontiac 6000 Back Up Light Bulb Size

The Pontiac 6000 back up light requires bulb size 1156 or P21W depending on the specific version of the vehicle. Data for the bulb specifications covers the range from 1982 to 1991.

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
1990-1991	1156
1982-1984	1156

Bulb Specifications

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

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Additional Notes

The 1156 is the sole bulb type listed for the back up light position across all specified model years of the Pontiac 6000.
The 1156 bulb follows the ANSI standard, meaning it conforms to a recognized North American specification used in both the United States and Canada.
It 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 lights simultaneously.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into place rather than screwed in.
The bulb operates at 12 volts and draws 21 watts, consistent with standard automotive electrical systems.
The 1156 is specified for the 1982-1984 model years and again for 1990-1991, with the same bulb size applying uniformly across both of those ranges.
Because the BA15s base is a single-contact design, it is not interchangeable with dual-contact bayonet bases such as the BA15d, even when the physical housing may resemble a compatible fit.