Chevrolet Corsica Check Engine Bulb Size

The Chevrolet Corsica check engine light requires bulb sizes PC74, PC37, or 168 depending on the specific instrument cluster configuration. Data for the light covers the 1989 to 1996 range.

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
1989	168

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 (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Chevrolet Corsica check engine bulb specifications cover three distinct bulb types across the listed model years: PC74, PC37, and 168.
The PC74 and PC37 are both T5 miniature wedge bulbs with printed circuit board twist-lock sockets, designed for instrument cluster applications. Both operate at 12V and conform to ANSI standards applicable in the US and Canada.
The PC74, used in the 1994-1996 Corsica, is rated at 1.4W. The PC37, used in the 1991-1993 model years, shares the same T5 form factor and twist-lock socket type but has no wattage listed in the specifications.
Although the PC74 and PC37 share the same T5 body type and socket style, they are distinct part numbers and are not confirmed as interchangeable. The wattage difference noted for the PC74 suggests a potential electrical distinction between the two.
The 1989 Corsica uses the 168 bulb, a T10 miniature wedge type rated at 12V and 4.9W. The T10 body is physically larger than the T5 used in later model years, making the 168 incompatible with sockets designed for PC74 or PC37 bulbs.
The shift from the 168 bulb in 1989 to the PC37 in 1991-1993 represents a change in both bulb size and socket type, from a standard wedge base to a printed circuit board twist-lock configuration.
The printed circuit board twist-lock socket used by both the PC74 and PC37 is a specialized mounting type specific to instrument cluster circuit boards, distinct from conventional wedge-base sockets found in other automotive lighting positions.