Chevrolet Cobalt Turn Signal Indicator Bulb Size

The Chevrolet Cobalt turn signal indicator requires a bulb size of 37 for the instrument panel lighting system. Data for the bulb size covers the range from 2005 to 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	37

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37

Other Locations

Additional Notes

The Chevrolet Cobalt uses the ANSI 37 bulb for its turn signal indicator across the full 2005-2010 model range.
The ANSI 37 is a miniature wedge-type bulb, classified under the T5 designation, which refers to a tubular envelope with a width of 5/8 inch.
The T5 wedge construction means the bulb connects directly through its base without a separate metal socket pin, relying instead on the tapered plastic base to make electrical contact.
The ANSI 37 operates at 12 volts and draws 1 watt, placing it among the lower-output bulbs used in automotive indicator applications.
The ANSI designation confirms the bulb meets standardized specifications recognized in both the United States and Canada, meaning units from either market share the same electrical and physical characteristics.
Because the same bulb size applies to every model year in the 2005-2010 range, a single replacement unit is compatible across all six years of the Cobalt without modification.
The 1-watt rating is characteristic of instrument panel and indicator lamp applications rather than exterior lighting, which typically demands significantly higher wattage.
The miniature wedge format of the ANSI 37 is a common fitment in dashboard and interior indicator positions, where space constraints favor compact bulb housings over bayonet or screw-base alternatives.