Chevrolet HHR front turn signal bulbs use 3157 size while rear turn signal bulbs use 3057 size. The replacement chart covers 2006 to 2011 vehicle 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.
The Chevrolet HHR uses the 3157 bulb for the front turn signal across the 2006-2011 model years covered in these specifications.
The rear turn signal on the Chevrolet HHR uses the 3057 bulb across the same 2006-2011 model years.
Both the 3157 and 3057 are dual-filament bulbs, meaning each unit contains two separate filaments that serve different lighting functions within the same housing.
The higher wattage filament in both bulbs operates at 27W, while the lower wattage filament operates at 7W, consistent with a design that supports both a brighter active signal and a dimmer secondary function.
Both bulbs operate on a 12V electrical system, which is standard for passenger vehicles of this type.
The 3157 and 3057 share the same T25 wedge base form factor, which refers to the physical shape and size of the base that inserts into the socket.
Both bulbs conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of performance and dimensional criteria for those markets.
Despite sharing the same T25 base and identical wattage ratings, the 3157 and 3057 are not the same part number, and the front and rear sockets on the HHR are designated for their respective bulb types.