Chevrolet Cobalt Trunk Bulb Size

The Chevrolet Cobalt trunk light utilizes a 168 bulb size for illumination within the rear storage compartment. Data for the specified component covers the period from 2005 through 2010.

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
2005-2010	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Chevrolet Cobalt uses the 168 bulb size for the trunk across all listed model years, spanning 2005-2010.
The 168 bulb is classified under the ANSI standard, which applies to both the United States and Canada.
This bulb follows the T10 form factor, a miniature wedge-base design that seats without a separate locking mechanism, relying instead on the wedge shape of its base to hold it in the socket.
The 168 bulb operates at 12 volts, consistent with the standard electrical system voltage found in passenger vehicles.
The rated wattage of the 168 bulb is 4.9W, placing it in the low-power range typical of interior and cargo area lighting applications.
The T10 wedge base is a widely used form factor, meaning the 168 bulb shares physical compatibility with a number of other bulb types that also use the T10 base, though wattage and voltage ratings should be matched before substitution.