The Chevrolet HHR brake light requires a 3057 bulb size for proper installation and function within the rear lighting assembly. Data for the specific component covers the range from 2006 to 2011.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet HHR uses the 3057 bulb for its brake lights across the 2006-2011 model years, with the 2008, 2009, and 2010 model years absent from the provided specifications.
The 3057 is a dual-filament wedge bulb classified under the T25 form factor, rated at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament.
Its dual-filament design allows a single bulb to serve two lighting functions simultaneously, typically combining stop light and tail light operation within one housing.
The 3057 designation follows the ANSI standard recognized in both the United States and Canada, indicating a standardized specification for electrical and physical characteristics.
The center high mount stop light on the Chevrolet HHR uses the 921 bulb across the 2006-2011 model years.
The 921 is a single-filament wedge bulb classified under the T15 form factor, rated at 12V and 16W, making it a lower-wattage component compared to the 3057.
The 921 also conforms to the ANSI standard for the US and Canadian markets, consistent with the 3057 used elsewhere in the same braking system.
The T25 and T15 designations refer to the tubular wedge base form factors of the respective bulbs, with T25 being physically larger than T15. These two bulb types are not interchangeable with each other due to differences in base size, wattage, and filament count.