Honda Pilot Turn Signal Bulb Size

Additional Notes

• The T20 wedge bulb family, which includes the 7440, 7440NA, 7443, 7443NA, 7444NA, and 7444NA types, is the most frequently specified bulb form factor across the Honda Pilot's front and rear turn signal positions, covering model years 2016-2024 at the front and 2003-2023 at the rear.
• The "NA" suffix on bulbs such as the 7440NA, 7443NA, and 7444NA denotes natural amber glass, meaning the amber color is built into the glass envelope itself rather than produced by an amber-tinted lens or housing. This is a factory-specified characteristic for the Honda Pilot's front turn signals across multiple generation years.
• The 7443NA and 7444NA are both dual-filament T20 wedge bulbs rated at 12V, 21W/5W, while the 7440NA is a single-filament T20 rated at 12V, 21W. Although these bulbs share the same T20 wedge base, their filament configurations differ, and they are not interchangeable without affecting turn signal or parking light function.
• The 2024-2023 Honda Pilot front turn signal uses the 7444NA, while the 2021-2019 years use the 7440NA. Both are T20 wedge bulbs, but the 7444NA is dual-filament and the 7440NA is single-filament, making them electrically incompatible despite their shared base type.
• The T25 wedge bulbs, specifically the 3457NA (dual-filament, 27W/7W) and 3357NA (single-filament, 27W), were specified for the Honda Pilot front turn signal between 2009-2015. These operate at higher wattage than the T20 family and use a physically larger wedge base, making cross-substitution with T20 bulbs impossible.
• The 2006 Honda Pilot front turn signal specifies the PY21W, which follows ECE standards used in European and worldwide markets rather than the ANSI standards applied to all other years in these specifications. The PY21W uses a BAU15s bayonet base, which is offset and not compatible with the BAY15d base found on the 1034NA or 1157NA types.
• The 2004-2005 front turn signal uses the 1034NA, described as a variant of the 1157NA, both of which use a BAY15d bayonet base. Despite their functional similarity, the 1034NA and 1157NA have different filament wattage ratios and are listed as distinct part numbers under ANSI standards.
• The rear turn signal across the Honda Pilot uses the 7443 or 7443NA in most years from 2003-2015, and transitions to the 7440 or 7440NA from 2016 onward. The 7443 is dual-filament and the 7440 is single-filament; substituting one for the other in a socket wired for dual-filament operation would result in loss of one lighting function.