Pontiac Montana Map Light Bulb Size

The Pontiac Montana map light requires bulb sizes 168 and 192 for the interior lighting components. Data for the specified vehicle covers the period from 1999 through 2006.

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
2006	192
2005	168 (With 2 Headlamps)
2005	192 (With 4 Headlamps)
1999-2004	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3W.	192
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Pontiac Montana map light uses one of two ANSI-standard miniature wedge bulbs across its model years: the 192 or the 168, both of which follow the T10 form factor and operate on a 12-volt circuit.
The 168 bulb is rated at 4.9 watts, while the 192 is rated at 3 watts. Although both share the same T10 wedge base, the wattage difference means they are not interchangeable without affecting light output.
The 168 bulb is the specified map light fitment for the Pontiac Montana across model years 1999-2004.
For the 2005 Montana, the correct map light bulb depends on the headlamp configuration. Vehicles equipped with 2 headlamps take the 168, while those equipped with 4 headlamps take the 192.
The 2006 Montana uses the 192 bulb for the map light, regardless of headlamp configuration.
The T10 wedge base is a common miniature bulb format in which the glass envelope itself acts as the retention mechanism, fitting directly into a wedge-style socket without a separate metal base or pins.
Because the 168 and 192 share the same T10 wedge base, physical installation of either into the other's socket is possible, making the wattage and headlamp configuration distinctions particularly relevant for the 2005 model year.