Hyundai Ioniq Trunk Bulb Size

The Hyundai Ioniq trunk requires DE3175 or DE3423 bulb sizes depending on the specific version of the component installed. Data for the listed items covers the range from 2017 to 2020.

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
2020	DE3175
2017-2018	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 31mm length, end-cap contacts. 12V.	DE3175
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The DE3423 and DE3175 are both festoon-type bulbs, meaning they are cylindrical in form and make electrical contact through metal caps at each end rather than through a base socket.
Both bulb types operate at 12 volts and conform to ANSI standards applicable in the United States and Canada.
The DE3175 measures 31mm in length, while the DE3423 measures 41mm in length, making the two bulbs physically incompatible with each other despite sharing the same festoon contact design.
The Hyundai Ioniq (2017-2018) uses the DE3423 for the trunk, whereas the 2020 model year uses the DE3175, reflecting a difference in housing size between those production periods.
Because the DE3175 and DE3423 differ in length by 10mm, substituting one for the other would result in an improper fit within the trunk light housing.