Honda Ridgeline Trunk Bulb Size

The Honda Ridgeline trunk light uses 168 and 921 bulb sizes for the internal lighting components. Data for the specified vehicle covers the range from 2006 through 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	168
2018-2019	921 (Cargo Light)
2017	921
2006-2014	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the most frequently specified trunk bulb across Honda Ridgeline model years, appearing in the 2006-2013, 2017, and 2018-2019 entries.
The 921 is a T15 wedge bulb rated at 12V and 16W, conforming to the ANSI standard used in the United States and Canada.
The 168 bulb is specified for the 2020 Honda Ridgeline, representing a distinct departure from the 921 used in prior model years.
The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, also conforming to the ANSI standard used in the United States and Canada.
The T10 and T15 designations refer to the outer width of the bulb envelope, with T10 measuring approximately 10/8 of an inch and T15 measuring approximately 15/8 of an inch, making the two bulbs physically non-interchangeable despite sharing the same wedge base style.
The 921 listed for 2018-2019 is specifically labeled as a Cargo Light, indicating its placement in the truck bed cargo area rather than a traditional enclosed trunk space.
The wattage difference between the 168 (4.9W) and the 921 (16W) is substantial, meaning the two bulb types draw significantly different amounts of power and are not electrically equivalent substitutes for one another.
Both the 168 and 921 use a wedge-style base, which requires no separate bulb holder or socket pins, as the base itself makes direct contact with the socket terminals.