Dodge Caravan Map Light Bulb Size

The Dodge Caravan map light utilizes bulb sizes 578, 906, 912, and PC579 depending on the specific version required for the interior lighting system. Provided information covers the range from 1984 through 2007 to assist with identifying the correct component for the vehicle.

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
2005-2007	PC579
2001-2004	578
2000	PC579
1996-1999	578
1993-1995	906
1987-1988	912
1984	912

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb with printed circuit board socket. 12V.	PC579
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 8W.	906
ANSI standard (US & Canada). Wedge bulb (T15). Variant of 921. 12V, 12W.	912

Other Locations

Additional Notes

The Dodge Caravan map light specifications reference four distinct bulb types across its model years: PC579, 578, 906, and 912. All four are ANSI-standardized bulbs rated for use in the US and Canada, and all operate at 12 volts.
The 578 bulb is the most frequently specified type in these records, covering the 1996-1999 and 2001-2004 model years. It is a festoon-style bulb with a 41mm length and end-cap contacts, rated at 12V and 12W.
The PC579 is a festoon bulb fitted with a printed circuit board socket, distinguishing it from the standard 578 despite both being festoon-type bulbs. This socket difference means the PC579 and 578 are not directly interchangeable, even though they share the same 12V operating voltage.
The Dodge Caravan uses the PC579 for the 2005-2007 model years and also for the 2000 model year. The 578 is specified for 1996-1999 and 2001-2004, meaning the two festoon types alternate across certain model years rather than following a single continuous transition.
The 906 is a miniature wedge bulb of the T10 form factor, rated at 12V and 8W. At 8W, it draws less power than the 578 and 912, both of which are rated at 12W. The 906 is specified for the 1993-1995 Caravan map light.
The 912 is a T15 wedge bulb and is noted as a variant of the 921 bulb. It is rated at 12V and 12W. The 912 is specified for the 1984, 1987, and 1988 model years of the Dodge Caravan.
The wedge-type bulbs (906 and 912) use a different socket interface than the festoon-type bulbs (578 and PC579). These two categories are not interchangeable with one another regardless of voltage compatibility.
The 912 and 578 share the same 12W power rating, but their physical form factors differ. The 912 is a T15 wedge and the 578 is a 41mm festoon, making them incompatible as direct substitutes despite the matching wattage.