Chevrolet Chevette Back Up Light Bulb Size

The Chevrolet Chevette back up light utilizes 1156 and P21W bulb sizes according to the provided specifications for the vehicle lighting system. Data for the bulb sizes covers the range from 1976 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	US Type	EU Type	Shop
1976-1987	1156	P21W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price

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Additional Notes

The Chevrolet Chevette uses the 1156 bulb for the back up light position across all listed model years, spanning 1976-1987.
The 1156 is a single-filament bulb, meaning it serves one lighting function only, which is consistent with its application in a dedicated back up light circuit.
The 1156 operates at 12 volts and 21 watts, placing it in the standard range for incandescent automotive reverse lighting.
The 1156 uses a BA15s bayonet base, where "BA15s" denotes a single-contact bayonet fitting with a 15mm base width.
The BA15s base is distinct from the BA15d double-contact bayonet base; substituting a double-contact bulb in a single-contact socket is not compatible.
The 1156 conforms to ANSI standards recognized in both the United States and Canada, indicating a standardized specification shared across North American markets.
Because the bulb specification is identical across the full 1976-1987 range for the Chevette, no year-specific fitment variation exists within this part application.