Pontiac G5 Dome Light Bulb Size

The Pontiac G5 dome light requires a 561 bulb size for proper installation within the interior overhead lighting housing. Data for the specified component covers the 2007 to 2009 range.

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
2007-2009	561

Bulb Specifications

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

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Additional Notes

The 561 bulb is the dome light specification for the Pontiac G5 across the 2007-2009 model years.
The 561 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at both ends rather than through a base socket.
Festoon bulbs are held in place by spring-loaded clips that press against the end caps, a mounting method common in interior dome and map light applications.
The 561 operates at 12 volts and draws 12 watts, which is standard for incandescent interior lighting in passenger vehicles of this era.
The 44mm length is a critical fitment factor, as festoon bulbs must physically span the distance between the two contact clips in the fixture housing.
The 561 carries ANSI standardization recognized in both the United States and Canada, meaning the designation refers to a consistent specification rather than a manufacturer-specific part number.
When substituting festoon bulbs, length compatibility is the primary fitment concern, as a bulb that is too short or too long will fail to make proper contact with the spring clips.