Chevrolet Cobalt Courtesy Bulb Size

The Chevrolet Cobalt courtesy light requires a 212-2 bulb size for proper installation and function within the interior lighting system. Data provided for the specific 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	212-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2

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Additional Notes

The 212-2 is the sole courtesy bulb size listed across all model years of the Chevrolet Cobalt covered in these specifications, spanning 2005-2010.
The 212-2 follows the ANSI standard, meaning it conforms to a specification recognized in both the United States and Canada.
The 212-2 is a festoon bulb, a cylindrical form factor that mounts by pressing its end caps into spring clips rather than using a twist or plug-in socket.
The bulb has a length of 41mm, which is a critical fitment factor, as festoon bulbs must match the exact span of the housing's clip contacts to seat correctly.
The SV8.5 base designation refers to the end-cap style used on this festoon bulb, and a replacement must share this base type to fit the retaining clips properly.
The 212-2 operates at 12 volts, consistent with standard automotive electrical systems.
The bulb carries a 12-watt rating, which reflects its power draw from the vehicle's electrical circuit during operation.
Because the 212-2 specification remains unchanged across the entire 2005-2010 Cobalt range, a single bulb type covers all listed model years without variation.