Buick Encore front turn signal bulbs use 7443NA or 7444NA sizes, while rear turn signal bulbs use 7440NA size. The replacement bulb chart covers 2013 through 2021 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The rear turn signal position on the Buick Encore uses the 7440NA across all listed model years (2013-2021), making it the most consistently specified bulb in these fitment records. It is a single-filament T20 wedge bulb rated at 12V and 21W under the ANSI standard applicable to the US and Canada.
The front turn signal position draws from two closely related bulbs: the 7443NA and the 7444NA. Both are dual-filament T20 wedge bulbs with natural amber glass, rated at 12V with a 21W/5W filament configuration, and both carry the same ANSI standard designation for the US and Canadian markets.
The "NA" suffix in all three bulb codes denotes natural amber glass, meaning the amber color is produced by the glass envelope itself rather than by an amber-coated or painted clear bulb. This construction is generally considered more resistant to color fading over time.
The dual-filament rating of 21W/5W on the 7443NA and 7444NA indicates that these bulbs serve two electrical circuits within a single housing, typically combining a higher-wattage turn signal function with a lower-wattage parking or position light function.
The Buick Encore (2014) front turn signal specifies the 7444NA rather than the 7443NA used in the surrounding model years. Although both bulbs share the same T20 form factor, voltage, and wattage ratings, they carry different ANSI part numbers and are not confirmed as interchangeable by these specifications.
The 7440NA used at the rear is a single-filament bulb, which distinguishes it functionally from the dual-filament 7443NA and 7444NA at the front. Substituting a single-filament bulb into a socket wired for dual-filament operation would result in the loss of one lighting function.