Honda Civic Trunk Bulb Size

The Honda Civic trunk light uses bulb sizes 12961, 6428, 13050, DE3021, and DE3022 depending on the specific version of the vehicle. Available data covers a span from 1973 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 Type	Shop
2024	12961	Check Price
1991	6428	Check Price
1990	13050	Check Price
1989	6428	Check Price
1987-1988	DE3021	Check Price
1986	6428	Check Price
1973-1983	DE3022	Check Price

Bulb Specifications

Description	Type	Shop
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.	12961	Check Price
ANSI standard (US & Canada). Festoon bulb, 36mm length, SV8.5 base. 12V, 5W.	6428	Check Price
OEM/Wagner part number. Halogen bulb, specialty application. 12V.	13050	Check Price
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3021	Check Price
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3022	Check Price

Other Locations

Additional Notes

The DE3022 is the most frequently specified trunk bulb across the Honda Civic's listed model years, appearing in every entry from 1973 through 1980, and again from 1975 through 1983. It is an ANSI-standard festoon bulb with a 31mm length and end-cap contacts, rated at 12V.
The DE3021 shares the same physical format as the DE3022, also a 31mm festoon type with end-cap contacts at 12V, and is specified for the 1987-1988 Honda Civic. The two bulbs carry different ANSI designations despite their structural similarities, which is relevant to fitment decisions.
The 6428 is an ANSI-standard festoon bulb rated at 12V and 5W, but it is longer than the DE3021 and DE3022 at 36mm, with an SV8.5 base. It is specified for the 1986, 1989, and 1991 model years.
Because the 6428 and the DE3021/DE3022 are both festoon-type bulbs but differ in length and base type, they are not interchangeable. Installing a 36mm bulb in a housing designed for a 31mm unit, or vice versa, would result in an improper fit.
The 12961, specified for the 2024 Honda Civic, is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W. Its wedge-base design is physically incompatible with the festoon-style sockets used in earlier Civic model years.
The 13050 is identified as an OEM/Wagner part number for a halogen bulb in a specialty application, rated at 12V, and is specified for the 1990 model year. Its halogen classification distinguishes it from the standard incandescent festoon and wedge bulbs used across the other listed years.
The 12961 is a Philips part number rather than an ANSI standard designation. Philips part numbers are manufacturer-specific, meaning cross-referencing with equivalent ANSI or other manufacturer codes may be necessary when sourcing replacements from different suppliers.
Across the listed specifications, three distinct base types are represented: the W2.1x9.5d wedge base (12961), the SV8.5 festoon base (6428), and the end-cap festoon contact style (DE3021, DE3022). Each base type corresponds to a different socket design, making cross-type substitution incompatible without socket modification.