Hyundai Sonata Sun Visor Bulb Size

The Hyundai Sonata sun visor uses a DE3423 bulb size for the vanity mirror illumination component. The replacement chart covers vehicle production spanning 2016 to 2018 with corresponding bulb specifications.

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
2016-2018	DE3423	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423	Check Price

Other Locations

Additional Notes

The DE3423 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base plug or pins.
The DE3423 operates at 12 volts, which is consistent with standard automotive electrical systems.
At 41mm in length, the DE3423 must fit within a fixed-length festoon socket, making physical length a critical factor in fitment. A bulb of a different length will not seat correctly in the socket even if the voltage rating matches.
The DE3423 conforms to ANSI standards applicable in the United States and Canada, indicating it meets a defined set of electrical and physical tolerances recognized in those markets.
The Hyundai Sonata uses the DE3423 for the sun visor bulb position across the 2016-2018 model years, reflecting consistent socket design across that production span.
Because festoon bulbs rely on end-cap contact rather than a keyed base, substitution with another festoon bulb is physically possible, but the 41mm length specification must be matched to ensure proper contact and fitment within the visor housing.