Typically, the 2007 Chevy Avalanche uses halogen headlight bulbs: H11 for the low beams and 9005 for the high beams.
Bulb sizes by function
Before replacing bulbs, it helps to know which bulbs correspond to each headlight function on the stock setup.
- Low beams: H11
- High beams: 9005 (also known as HB5)
In most standard configurations, these two bulb sizes cover the primary headlights. If your vehicle has aftermarket headlights, a factory HID option, or different trim equipment, confirm the exact bulb types before purchasing replacements.
Notes on variations and upgrades
Some 2007 Avalanches were equipped with optional features or aftermarket headlight assemblies that can change bulb requirements. Fog lights, when present, typically use a separate bulb type (often H3) and are not part of the main headlight bulb pairing.
Upgrade considerations
Owners may consider higher-performance halogen bulbs or conversions to LED/HID setups. Any such change can affect fitment, electrical load, and legal compliance. Always verify compatibility with your specific headlight housing and consult the vehicle manual or a trusted parts specialist before making changes.
Summary
For a stock 2007 Chevy Avalanche with standard halogen headlights, you’ll most commonly need H11 bulbs for the low beams and 9005 bulbs for the high beams. If your truck has different equipment, check the owner’s manual or a reliable parts diagram to confirm the correct bulb types, especially if aftermarket components are installed.