Chevrolet Cobalt front side marker bulbs use a 192 size, while rear side marker bulbs use a 194 size. The replacement chart covers 2005 through 2010 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Cobalt uses the 192 bulb for the front side marker position across all model years from 2005-2010.
The rear side marker position across the same 2005-2010 model year range uses the 194 bulb instead.
Both the 192 and 194 are ANSI-standardized bulbs recognized in the United States and Canada, meaning they conform to a defined set of electrical and physical specifications rather than being proprietary to a single manufacturer.
Both bulbs share the T10 miniature wedge form factor, which refers to a small, wedge-shaped base that seats directly into a socket without a separate metal cap or bayonet pin.
Both bulbs operate at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The 192 and 194 differ in power consumption: the 192 draws 3 watts while the 194 draws 3.78 watts, meaning the two bulbs are not electrically identical despite sharing the same T10 base type.
Because the 192 and 194 share the T10 wedge base, they are physically interchangeable in terms of socket fitment, but the difference in wattage means substituting one for the other affects the light output and current draw at that position.