Hyundai Ioniq Dome Light Bulb Size

The Hyundai Ioniq dome light uses a DE3175 bulb size for interior illumination across multiple model generations. A replacement chart documents bulb specifications covering 2017 through 2020 production years.

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 (With Halogen Capsule Headlamps)
2017-2019	DE3175

Bulb Specifications

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

Other Locations

Additional Notes

The DE3175 is the dome light bulb type used across the 2017-2020 Hyundai Ioniq, making it the sole bulb type represented in these specifications.
The DE3175 follows the ANSI standard, which is the recognized electrical component standard for the United States and Canada.
As a festoon-type bulb, the DE3175 sits horizontally in its housing and makes contact at both ends through end-cap terminals rather than through a base socket.
The DE3175 has a 31mm length and operates at 12 volts, consistent with standard automotive electrical systems.
The 2020 Hyundai Ioniq specification includes a conditional note indicating the DE3175 applies to vehicles equipped with Halogen Capsule Headlamps, distinguishing it from other possible headlamp configurations in that model year.
The 2017-2019 model years carry no such conditional notation, indicating the DE3175 applies without trim or equipment qualifications for those years.