Chevrolet Corvette Check Engine Bulb Size

The Chevrolet Corvette check engine light requires bulb size 74 or 194 depending on the specific configuration of the instrument cluster. Data for the bulb sizes covers the range from 1988 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
1995-1996	74
1988	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The Chevrolet Corvette check engine light uses two distinct bulb sizes across the listed model years: the 74 and the 194, both of which follow ANSI standards recognized in the US and Canada.
The 74 bulb is a T5 miniature wedge type rated at 12V and 1.4W, and it fits the 1995-1996 Corvette check engine light position.
The 194 bulb is a T10 miniature wedge type rated at 12V and 3.78W, and it fits the 1988 Corvette check engine light position.
Although both the 74 and 194 are miniature wedge bulbs sharing the same 12V operating voltage, they are not interchangeable. The T5 and T10 designations refer to different physical tube widths, measured in eighths of an inch, making the 194 physically larger than the 74.
The 194 draws 3.78W compared to the 74's 1.4W, meaning the two bulbs also differ in power consumption, which reflects their different socket and circuit requirements.
The wedge base design used by both bulb types means the base itself acts as the contact point, with no separate metal base or pins involved, a construction common in instrument cluster and indicator light applications.
ANSI standardization for both bulbs means replacement units sourced from different manufacturers are expected to conform to the same electrical and physical specifications as the originals.