Chevrolet Avalanche high beam headlight bulbs use 9005 size while low beam headlight bulbs use H11 size. The replacement chart covers 2007 to 2013 model years 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.
The Chevrolet Avalanche uses the 9005 bulb for high beam headlights and the H11 bulb for low beam headlights across the 2007-2013 model years.
The 9005 is a single-filament halogen bulb operating at 12V and 65W, built to the ANSI standard used in the United States and Canada, and fitted with a P20d base.
The H11 is a single-filament halogen bulb operating at 12V and 55W, built to the ECE standard used in Europe and worldwide, and fitted with a PGJ19-2 base, though it also carries approval for use in the United States.
Because the 9005 and H11 carry different base types, the P20d and PGJ19-2 respectively, the two bulbs are not interchangeable with each other despite both being single-filament halogen types rated at 12V.
The 9005 draws 65W while the H11 draws 55W, meaning the high beam circuit in the Chevrolet Avalanche (2007-2013) is designed to handle a higher wattage load than the low beam circuit.
The H11 bulb originates from the ECE regulatory framework, which governs lighting standards across a broader international market than the ANSI framework that defines the 9005.
Both bulbs share the same operating voltage of 12V, which is consistent with standard 12-volt automotive electrical systems.
The single-filament construction of both the 9005 and H11 means each bulb serves only one lighting function, which is why separate bulb types are required for the high beam and low beam positions.