Honda Ridgeline Back Up Light Bulb Size

The Honda Ridgeline back up light utilizes 7440 and 921 bulb sizes depending on the specific version of the vehicle. Available information covers a range from 2006 through 2024 for the components listed.

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
2023-2024	7440
2017-2020	7440
2006-2014	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T20). 12V, 21W.	7440
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The Honda Ridgeline backup light specifications cover two distinct bulb sizes across the listed model years: the 7440 and the 921, both of which conform to ANSI standards applicable in the US and Canada.
The 7440 is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and it fits the Honda Ridgeline for the 2017-2020 and 2023-2024 model years.
The T20 form factor of the 7440 is physically larger than the T15 form factor of the 921, making the two bulbs non-interchangeable despite sharing the same wedge base style.
The 921 is a wedge bulb in the T15 form factor, rated at 12V and 16W, and it fits the Honda Ridgeline for the 2006-2014 model years.
The 7440 operates at 21W while the 921 operates at 16W, meaning the 7440 draws more power and produces greater output under the same 12V supply.
Both bulbs use a wedge-style base, which requires no locking pins or bayonet turns for installation, as the base itself is held in place by tension within the socket.
Because the two bulbs differ in both form factor and wattage, a 921 cannot serve as a direct replacement in a socket designed for a 7440, and vice versa.
ANSI standardization means that any 7440 or 921 bulb from different manufacturers sharing the same designation is expected to conform to the same electrical and physical specifications.