Chevrolet Cobalt Parking Light Bulb Size

The Chevrolet Cobalt parking light requires bulb size 3457NA or 3357NA depending on the specific vehicle configuration. Data for the provided bulb sizes covers the range from 2005 to 2010.

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
2006-2010	3457NA
2005	3357NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3457NA
ANSI standard (US & Canada). Single-filament wedge bulb (T25), natural amber glass. 12V, 27W.	3357NA

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Additional Notes

The Chevrolet Cobalt parking light specifications cover the 2005-2010 model years, with two distinct bulb sizes used across that span.
The 3457NA is the predominant bulb across this application, fitted to the 2006-2010 model years.
Both the 3457NA and 3357NA follow ANSI standards recognized in the United States and Canada, and both are housed in a T25 wedge form factor with natural amber glass.
Natural amber glass produces an amber-tinted output directly from the bulb envelope, without relying on a colored lens to achieve the required parking light color.
The 3457NA is a dual-filament bulb rated at 12V with a 27W high filament and a 7W low filament, allowing it to serve two lighting functions within a single housing.
The 3357NA, specified for the 2005 Cobalt, is a single-filament bulb rated at 12V and 27W, meaning it is capable of only one lighting function.
Although the 3457NA and 3357NA share the same T25 wedge base and natural amber glass, the difference in filament count represents a functional distinction that affects interchangeability.
The 3357NA cannot replicate the dual-filament behavior of the 3457NA; substituting one for the other in a socket designed for dual-filament operation would result in the loss of one lighting function.