Dodge Caliber Map Light Bulb Size

The Dodge Caliber map light requires a bulb size of 578 for proper installation and function within the interior overhead lighting housing. Data for the specific component covers a range from 2007 through 2012.

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
2007-2012	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

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Additional Notes

The Dodge Caliber uses the 578 bulb size for the map light across all listed model years, spanning 2007-2012.
The 578 is an ANSI-standardized bulb type, meaning its specifications are governed by a recognized North American standard applicable in both the US and Canada.
This bulb follows a festoon design, which is a cylindrical form factor held in place by spring-loaded end caps rather than a socket base.
The 578 bulb has a length of 41mm, a measurement that is critical for fitment, as festoon bulbs must physically span the distance between their mounting contacts.
Electrical contact is made through end-cap terminals at both ends of the bulb, a characteristic of the festoon type that distinguishes it from wedge or bayonet base bulbs.
The 578 operates at 12 volts, consistent with standard automotive electrical systems.
At 12 watts, the 578 draws a relatively modest amount of power for an interior lighting application.
Because the 578 is an ANSI-standardized festoon bulb, it is interchangeable with other bulbs of the same designation regardless of manufacturer, provided the 41mm length and end-cap contact type are matched.