Chevrolet Cobalt Automatic Transmission Indicator Bulb Size

The Chevrolet Cobalt automatic transmission indicator requires a bulb size of 37 for the specific lighting component located within the interior console area. Data for the bulb specifications covers the range of 2005 through 2010 for the vehicle models listed.

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 Type	Shop
2005-2010	37	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1W.	37	Check Price

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Additional Notes

The Chevrolet Cobalt uses the 37 bulb for the automatic transmission indicator across all listed model years, spanning 2005-2010.
The 37 bulb is classified under the ANSI standard, which applies to the United States and Canada markets.
It belongs to the T5 form factor, a miniature wedge-base bulb type commonly used in instrument panel and indicator applications where space is limited.
The wedge base design means the bulb is held in place by tension from its socket contacts rather than a separate bayonet or screw mechanism, making it a tool-free replacement in most cases.
The 37 bulb operates at 12 volts, consistent with standard automotive electrical systems.
Its rated wattage of 1W places it among the lowest-draw incandescent bulbs used in automotive interiors, reflecting its role as a small indicator light rather than an illumination source.
The T5 designation refers to the bulb envelope width, expressed in eighths of an inch, making the envelope approximately 5/8 of an inch wide.
Because the same bulb size applies uniformly across the 2005-2010 Cobalt for this application, a single replacement part covers the full production span listed in these specifications.