The Pontiac J2000 Sunbird uses a 2057 bulb size for both front and rear turn signal applications. The replacement chart covers 1984 to 1985 model 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.
The 2057 is the sole bulb type listed across all turn signal positions for the Pontiac J2000 Sunbird, covering both the 1984-1985 model years.
The 2057 bulb follows the ANSI standard, meaning it conforms to a standardized specification recognized in both the United States and Canada.
As a dual-filament bulb, the 2057 operates two separate filaments within a single envelope, one for higher-intensity signaling and one for lower-intensity running light use.
The 2057 uses a BAY15d bayonet base, a two-pin offset base design that physically prevents incorrect insertion by positioning the two pins at different heights.
The 2057 operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles of this era.
Its wattage rating is 26.9W on the high-intensity filament and 8W on the low-intensity filament, reflecting the difference in brightness between active signaling and continuous running light functions.
The 2057 is described as a brighter variant of the 1157, meaning the two types share the same BAY15d base and are physically interchangeable in many sockets, though the 2057 produces greater output on its high-intensity filament.
Because the 2057 and 1157 share the same base type, substituting one for the other is physically possible, but the difference in filament wattage means the light output will not be identical between the two types.
The same bulb size applies to both the front and rear turn signal positions for the 1984-1985 J2000 Sunbird, indicating no distinction in bulb specification between those two locations.