Chevrolet Impala Limited high beam headlight uses an H9 bulb size while low beam headlight uses an H11 bulb size. The replacement chart covers 2014 to 2016 vehicle 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 Impala Limited uses the H9 bulb for high beam headlights across all three model years covered in the specifications, 2014-2016.
The H9 is a single-filament halogen bulb operating at 12V and 65W, built to the ECE standard used in Europe and worldwide, with a PGJ19-5 base, and carries approval for use in the United States as well.
The low beam headlight position across the same 2014-2016 model years uses the H11 bulb.
The H11 is a single-filament halogen bulb rated at 12V and 55W, also produced to the ECE standard, and fitted with a PGJ19-2 base, with US approval as well.
Although the H9 and H11 are both single-filament halogen bulbs sharing the same 12V operating voltage and the same general PGJ19 base family, their base subtypes differ, PGJ19-5 for the H9 and PGJ19-2 for the H11, making the two bulbs physically non-interchangeable between the high and low beam positions.
The wattage difference between the two bulbs is notable: the H9 at 65W draws more power and produces a higher-intensity output suited to the high beam function, while the H11 at 55W operates at a lower output level consistent with the low beam role.