GMC Sonoma Map Light Bulb Size

The GMC Sonoma map light requires a 212-2 or 194 bulb size depending on the specific vehicle configuration. Data for the provided components covers the range from 1993 through 2004.

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
1995-2004	212-2
1993	194

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	212-2
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The GMC Sonoma uses the 212-2 bulb as its map light across the 1995-2004 model years, making it the dominant fitment in these specifications.
The 212-2 is a festoon-style bulb, meaning it is cylindrical and mounts by pressing between two spring clips rather than inserting into a socket.
The 212-2 bulb measures 41mm in length and uses an SV8.5 base, operating at 12 volts and drawing 12 watts.
The 212-2 carries ANSI standardization for both the United States and Canada, indicating it conforms to a defined performance and construction standard in both markets.
The 1993 GMC Sonoma uses a different map light bulb entirely, the 194, which is a miniature wedge-type bulb rather than a festoon.
The 194 bulb follows the T10 wedge form factor, which inserts directly into a wedge socket without a separate base mechanism, distinguishing it physically from the 212-2.
At 3.78 watts, the 194 draws considerably less power than the 12-watt 212-2, meaning the two bulbs are not electrically equivalent and are not interchangeable.
The physical mounting styles of the 212-2 festoon and the 194 wedge are incompatible with each other, reinforcing that substitution between the 1993 and 1995-2004 fitments is not possible without modification.
Both the 212-2 and the 194 are ANSI-rated at 12 volts, consistent with standard automotive electrical systems in their respective model years.