Volkswagen Jetta Trunk Bulb Size

The Volkswagen Jetta trunk utilizes 6411, DE3423, and 12961 bulb sizes for illumination within the rear storage compartment. Available data for the specified vehicle covers the range from 1980 through 2024.

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
2023-2024	6411
2021	6411
2020	DE3423
2015-2019	6411
2006-2009	6411
2004	12961
2000	12961
1999	DE3423
1999	12961 (Late Model)
1986-1998	DE3423
1980-1984	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6411
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961

Other Locations

Additional Notes

The 6411 and DE3423 are both festoon-type bulbs, meaning they are cylindrical lamps that make contact at each end rather than through a screw or wedge base. Despite sharing this general form factor, they are not interchangeable, as the 6411 measures 36mm in length with an SV8.5 base, while the DE3423 measures 41mm with end-cap contacts.
The 6411 is the most frequently specified trunk bulb across the Volkswagen Jetta's history in these specifications, appearing across model years 2006-2009, 2015-2019, and 2021-2024.
The DE3423 operates at 12V but carries no wattage rating in these specifications, whereas the 6411 is rated at 12V and 5W. Both conform to ANSI standards applicable in the United States and Canada.
The 12961 is a Philips part number rather than an ANSI designation, identifying a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base. It operates at 12V and 5W, and its wedge base design differs fundamentally from the festoon construction of the 6411 and DE3423.
The 1999 Volkswagen Jetta carries two separate trunk bulb entries: the DE3423 for early production units and the 12961 for late-model units, indicating a mid-year specification change within that model year.
The DE3423 is specified for the 2020 model year, placing it as an isolated fitment between extended runs of the 6411, which means the 2020 unit does not share trunk bulb compatibility with adjacent model years.