Honda Ridgeline Headlight Bulb Size

Additional Notes

• The 9003 bulb is a dual-filament halogen type rated at 12V with a 60W high beam filament and a 55W low beam filament, using a P43t base. Its dual-filament design means a single bulb handles both high and low beam functions in the Honda Ridgeline model years that specify it.
• The Honda Ridgeline used the 9003 bulb for both high beam and low beam headlights across the 2006-2014 model years, making it the most widely specified bulb type across the full range of data provided.
• The 9005 is a single-filament halogen bulb rated at 12V and 65W, fitted with a P20d base. Because it carries only one filament, it serves exclusively as a dedicated high beam bulb rather than a combined high/low beam unit.
• The 9005 bulb is specified for the high beam headlight position on the Ridgeline for the 2017-2020 and 2023-2024 model years.
• The H11 is a single-filament halogen bulb rated at 12V and 55W, using a PGJ19-2 base. It follows the ECE standard used in Europe and worldwide, though it also carries approval for use in the United States.
• The H11 bulb applies to the low beam headlight position on the Ridgeline for the 2017-2020 model years, specifically on vehicles equipped with halogen capsule headlamps, indicating a trim-level or package-dependent fitment.
• The P20d base on the 9005 and the P43t base on the 9003 are physically distinct and incompatible with each other, meaning these bulbs are not interchangeable despite both being ANSI-standard halogen types operating at 12V.
• The H11 uses a PGJ19-2 base, which differs from both the P20d and P43t bases found on the 9005 and 9003 respectively, making cross-substitution between the H11 and either of those bulb types physically incompatible.
• For the 2017-2020 Ridgeline, the high beam and low beam headlight positions require two different bulb types, the 9005 and H11 respectively, on vehicles with halogen capsule headlamps, so the positions are not served by a single shared bulb as they are in earlier model years.
• The 9003 bulb, also known internationally as H4, operates both filaments through a single P43t base, whereas the 9005 and H11 each manage only one function per bulb, reflecting a fundamental difference in headlight system architecture between the earlier and later Ridgeline configurations.