Mazda CX-5 Trunk Bulb Size

The Mazda CX-5 trunk bulb uses 2 distinct sizes: DE3175 and DE3423, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 2013 through 2023 model year data for trunk illumination 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
2021-2023	DE3175	Check Price
2016-2018	DE3175	Check Price
2013-2014	DE3423	Check Price

Bulb Specifications

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

Other Locations

Additional Notes

The Mazda CX-5 trunk uses two festoon bulb types across its model years: the DE3175 and the DE3423, both of which are ANSI-standard bulbs rated for the North American market.
Festoon bulbs are cylindrical lamps that mount horizontally between two spring-clip or end-cap contacts, making physical length a critical fitment factor.
The DE3175 is a 31mm festoon bulb operating at 12V, and it is the specified trunk bulb for the CX-5 across the 2016-2018 and 2021-2023 model years.
The DE3423 is a 41mm festoon bulb operating at 12V, and it is the specified trunk bulb for the 2013-2014 CX-5.
The DE3175 and DE3423 differ by 10mm in length, which means the two types are not interchangeable despite sharing the same end-cap contact design and operating voltage.
Installing a festoon bulb of the wrong length in a spring-clip socket can result in a loose fit, intermittent contact, or failure to seat properly within the housing.
Both bulb types conform to ANSI standards as applied in the United States and Canada, meaning replacement bulbs sourced from those markets should meet the same dimensional and electrical specifications.