Pontiac G6 Dome Light Bulb Size

The Pontiac G6 dome light requires a 561 bulb size for proper installation within the interior overhead housing. Data for the bulb specifications 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
2010	561
2005	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

Other Locations

Additional Notes

The 561 bulb is the sole dome light bulb size listed for the Pontiac G6, appearing across both documented model years.
The 561 is classified as a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
At 44mm in length, the 561 fits into a spring-loaded festoon holder, where the end caps press against two opposing contact points inside the housing.
The 561 operates at 12 volts and draws 12 watts, which is consistent with standard automotive interior lighting powered directly from a vehicle's 12V electrical system.
The 561 carries an ANSI designation, indicating it conforms to a standardized specification recognized in both the United States and Canada.
Because festoon bulbs are sized primarily by their length, substituting a festoon bulb of a different length, such as a 31mm or 36mm unit, would result in poor contact or an inability to seat properly in the 44mm holder.