Chevrolet Sonic front turn signal bulbs utilize 7444NA and 7443NA sizes, while rear turn signal bulbs require 7440NA size bulbs. The replacement chart covers 2017 through 2020 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Sonic front turn signal uses the 7444NA for the 2019-2020 model years and the 7443NA for the 2017-2018 model years. These are distinct part numbers and are not interchangeable without verification, despite sharing several electrical and physical characteristics.
The 7444NA and 7443NA are both dual-filament wedge bulbs in the T20 form factor, rated at 12V with a 21W/5W power draw. The dual-filament design means one filament handles the higher-wattage turn signal function while the second filament operates at 5W, typically serving a parking or running light function.
The rear turn signal on the Chevrolet Sonic uses the 7440NA across all listed model years, 2017-2020, making it consistent throughout that span.
The 7440NA is a single-filament wedge bulb in the T20 form factor, rated at 12V and 21W. Unlike the front turn signal bulbs, it carries only one filament, meaning it serves a single lighting function rather than a combined one.
All three bulb types, the 7444NA, 7443NA, and 7440NA, share the T20 wedge base and are built to ANSI standards applicable in both the United States and Canada. The shared base form factor does not make them interchangeable, as filament count and wattage ratings differ between the front and rear applications.
The natural amber glass construction of all three bulb types produces the amber turn signal color directly through the glass envelope rather than relying on a colored lens or housing to filter a clear bulb. This is the defining characteristic of the "NA" suffix in each part number.