Chevrolet Corsica Turn Signal Indicator Bulb Size

The Chevrolet Corsica turn signal indicator uses bulb sizes PC74, PC37, and 74 depending on the specific version of the vehicle. Available data for the bulb specifications covers the range from 1987 to 1996.

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
1994-1996	PC74
1991-1993	PC37
1987-1990	74

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V, 1.4W.	PC74
ANSI standard (US & Canada). Miniature wedge bulb (T5) with printed circuit board twist-lock socket, for instrument clusters. 12V.	PC37
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74

Other Locations

Additional Notes

The Chevrolet Corsica turn signal indicator bulb specifications span the full production run of the model, covering 1987-1996, with three distinct bulb types used across those years.
The bulb type 74 is a T5 miniature wedge bulb rated at 12V and 1.4W, conforming to ANSI standards for the US and Canadian markets. It was fitted to the Corsica from 1987-1990.
A T5 miniature wedge bulb uses a wedge-shaped base that friction-fits directly into a socket without a separate metal base, making it a compact solution for instrument cluster applications.
The PC37 type shares the same T5 miniature wedge form factor as the 74 but adds a printed circuit board twist-lock socket, which mechanically locks the bulb into place by rotating it within the socket. The PC37 does not carry a listed wattage rating. It was used in the Corsica from 1991-1993.
The PC74 type combines the 12V, 1.4W electrical characteristics of the 74 bulb with the printed circuit board twist-lock socket of the PC37. It was fitted to the Corsica from 1994-1996.
The twist-lock socket design of the PC37 and PC74 is not interchangeable with the standard wedge socket used by the 74, as the mounting and retention mechanisms differ between the two socket types.
Although the 74 and PC74 share the same T5 form factor and 12V, 1.4W ratings, the PC74 requires a printed circuit board socket, which means the 74 cannot serve as a direct replacement in vehicles fitted with PC-type sockets.
All three bulb types conform to ANSI standards applicable to both the United States and Canada, indicating consistent regulatory compliance across the entire production span of the Corsica.