Chevrolet Bolt EV Map Light Bulb Size

The Chevrolet Bolt EV map light requires bulb size 12961 or 194 depending on the specific configuration of the lighting assembly. Data for the lighting components covers the range from 2017 through 2023.

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
2023	12961
2021	194
2020	12961
2019	12961 (Front Center, For Vehicle With Value Added Assembly Roof Trim (VRK))
2017-2018	12961

Bulb Specifications

Description	Bulb Size
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.	194

Other Locations

Additional Notes

The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and rated at 12 volts and 5 watts. It is the predominant map light bulb across the Chevrolet Bolt EV, appearing in the 2017-2020 and 2023 model years.
The W2.1x9.5d base designation refers to a wedge-type base where the two numerical values describe the contact pin spacing and insertion depth, respectively. This base type is standard across a wide range of miniature automotive lighting applications.
The 194 is an ANSI-standardized bulb designation recognized in both the United States and Canada. It shares the T10 wedge form factor with the 12961 but operates at a lower wattage of 3.78 watts rather than 5 watts.
The 2021 Chevrolet Bolt EV map light uses the 194 bulb rather than the 12961 found in surrounding model years. Because the two bulbs differ in wattage despite sharing the T10 form factor, substituting one for the other without accounting for the wattage difference is a relevant fitment consideration.
The 2019 Bolt EV specifies the 12961 bulb specifically for the front center map light position on vehicles equipped with the Value Added Assembly Roof Trim package, identified by option code VRK. This indicates that map light bulb fitment for that model year is conditional on the installed trim configuration.