Chevrolet Avalanche Tail Light Bulb Size

The Chevrolet Avalanche tail light utilizes 3047 and 3057 bulb sizes for the rear lighting components. Data for the specific bulbs covers the period from 2007 through 2013.

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
2011-2013	3047
2007-2010	3057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3047
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057

Other Locations

Additional Notes

The Chevrolet Avalanche uses two distinct tail light bulb sizes across its 2007-2013 model years: the 3047 and the 3057, both of which follow ANSI standards recognized in the United States and Canada.
Both the 3047 and 3057 are T25 wedge-base bulbs operating at 12 volts, making them identical in base type and voltage rating.
The primary technical difference between the two bulbs is filament count. The 3047 is a single-filament bulb rated at 27W, while the 3057 is a dual-filament bulb rated at 27W and 7W, with the lower wattage filament typically serving a secondary function such as running light or parking light operation.
The Chevrolet Avalanche (2011-2013) takes the 3047 bulb for the tail light position, while the 2007-2010 model years require the 3057.
Despite sharing the same T25 wedge base, the 3047 and 3057 are not interchangeable. Installing a single-filament 3047 in a socket designed for the dual-filament 3057 would result in the loss of one lighting function.
The reverse also presents a fitment concern: a 3057 placed in a 3047 application may not operate as intended, since the socket wiring would only engage one of the two available filaments.