Chevrolet C-Series Pickup Check Engine Bulb Size

Chevrolet C-Series Pickup check engine bulb sizes 74 and 194 are specified in this bulb size reference. The replacement chart covers vehicle production spanning 1990 to 2000.

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
1993-2000	74	W1.2W	Check Price
1990-1991	194	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74	Check Price
ECE standard (Europe & worldwide). Miniature wedge bulb (T5) with W2x4.6d base. 12V, 1.2W.	W1.2W	Check Price
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

Other Locations

Additional Notes

The Chevrolet C-Series Pickup uses two distinct bulb sizes for the check engine light across its model years: the 74 and the 194, both of which are ANSI-standard miniature wedge bulbs rated for 12 volts.
The 74 bulb follows a T5 wedge form factor and draws 1.4 watts, making it a lower-wattage unit relative to the 194.
The 194 bulb uses a T10 wedge form factor and draws 3.78 watts. The T10 is physically larger than the T5, and the two types are not interchangeable despite sharing the same 12-volt operating voltage.
For the 1993-2000 Chevrolet C-Series Pickup, the specified check engine bulb is the 74 (T5, 12V, 1.4W).
The 1990-1991 model years use the 194 (T10, 12V, 3.78W) for the check engine light, a different bulb type than the one used in later years of the same model.
The T5 and T10 designations refer to the bulb's tubular envelope width, measured in units of one-eighth of an inch, meaning the T5 is 5/8 inch wide and the T10 is 10/8 inch wide at the widest point of the envelope.