Chevrolet Avalanche Turn Signal Bulb Size

The Chevrolet Avalanche front turn signal requires bulb sizes 3157NA, 4157NA, or 5702AK, while the rear turn signal uses 3047 or 3057 bulb sizes. The replacement chart covers vehicle production years spanning 2007 to 2013 with corresponding bulb size specifications.

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

Front Turn Signal

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2010-2013	3157NA	PY27/7W	Check Price
2009	4157NA	PY27/7W	Check Price
2007-2008	5702AK	5702AK	Check Price

Rear Turn Signal

Years	Bulb Type	Shop
2011-2013	3047	Check Price
2007-2010	3057	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA	Check Price
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	4157NA	Check Price
Sylvania part number for a coated variant of the ANSI 3157 bulb. Dual-filament wedge bulb (T25), amber coating. 12V, 27W/7W.	5702AK	Check Price
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3047	Check Price
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3057	Check Price

Other Locations

Additional Notes

The front turn signal position across the 2007-2013 Chevrolet Avalanche uses three distinct bulb types: the 5702AK for 2007-2008, the 4157NA for 2009, and the 3157NA for 2010-2013. All three share the same T25 wedge base and 12V, 27W/7W dual-filament electrical ratings.
The 3157NA and 4157NA are both ANSI-standardized dual-filament T25 wedge bulbs with natural amber glass and identical 12V, 27W/7W ratings. The two part numbers are separate ANSI designations despite their shared specifications.
The 5702AK is a Sylvania-specific part number for a variant of the ANSI 3157 bulb. It carries an amber coating rather than natural amber glass, though its electrical output of 12V, 27W/7W matches the 3157NA and 4157NA.
The amber coloring on front turn signal bulbs in these specifications is achieved through two different methods depending on the year: natural amber glass on the 3157NA and 4157NA, and an applied amber coating on the 5702AK used in 2007-2008.
The rear turn signal position shifted from the dual-filament 3057 to the single-filament 3047 between the 2010 and 2011 model years. Both are T25 wedge bulbs rated at 12V, but the 3047 carries only a single 27W filament while the 3057 carries filaments rated at 27W and 7W.
The 3047 and 3057 are not interchangeable without consideration of filament count. The 3057 supports a secondary low-power filament, which is absent in the 3047. Substituting one for the other may affect circuit behavior depending on how the vehicle's lighting system uses the secondary filament.
All bulb types listed across both the front and rear turn signal positions use the T25 wedge base format, meaning the physical socket type is consistent throughout the entire specification set for the Chevrolet Avalanche 2007-2013.
The front turn signal bulbs across all listed years are dual-filament types, while the rear turn signal position uses a single-filament bulb (3047) for 2011-2013 and a dual-filament bulb (3057) for 2007-2010.