Chevrolet Avalanche Luggage Compartment Bulb Size

The Chevrolet Avalanche luggage compartment utilizes a 921 bulb size for the internal lighting component. Data for the specified vehicle 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
2007-2013	921

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921

Other Locations

Additional Notes

The 921 bulb is the sole luggage compartment bulb size listed across all Chevrolet Avalanche model years in these specifications, covering 2007-2013.
The 921 is a wedge-type bulb, meaning it uses a plastic wedge base rather than a metal contact pin or bayonet fitting, allowing it to be inserted and removed without a socket rotation.
The T15 designation refers to the bulb's tubular envelope size, where 15 indicates a width of 15/8 of an inch, making it a relatively compact light source suited to enclosed cargo area applications.
The 921 operates at 12 volts and 16 watts, which is consistent with standard automotive low-voltage electrical systems and places it in the mid-range of common interior bulb wattages.
The ANSI standard classification confirms the 921 follows a regulated specification recognized in both the United States and Canada, meaning physical and electrical tolerances are defined by an independent standards body rather than a single manufacturer.
Because the 921 is an ANSI-standardized wedge bulb, other bulbs sharing the T15 wedge base and rated at 12V/16W may be physically interchangeable, though electrical compatibility should be confirmed against the vehicle's socket rating before substitution.