Chevrolet Impala Limited Dome Light Bulb Size

The Chevrolet Impala Limited dome light requires a 578 bulb size for interior illumination. The replacement chart covers 2014 to 2016 production years with corresponding bulb specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2014-2016	578

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578

Other Locations

Additional Notes

The 578 bulb is the dome light specification for the Chevrolet Impala Limited across its 2014-2016 model years.
The 578 is a festoon-type bulb, meaning it is cylindrical in shape and makes electrical contact through metal caps at both ends rather than through a base socket.
The bulb operates at 12 volts and 12 watts, which is consistent with standard automotive low-voltage electrical systems.
The 578 designation follows ANSI standardization, meaning it conforms to a defined specification recognized across the United States and Canada.
The festoon body of the 578 measures 41mm in length, which determines physical fitment within the dome light housing.
End-cap contact festoon bulbs are not universally interchangeable with all festoon sizes, as housing clip spacing is matched to a specific bulb length, making the 41mm length a critical fitment factor.