Hummer H2 Back Up Light Bulb Size

The Hummer H2 back up light utilizes 3157 and 2458 bulb sizes for the rear illumination system. Data for the specified components covers the period from 2003 through 2009.

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
2003-2009	3157

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157

Other Locations

Additional Notes

The Hummer H2 uses the 3157 bulb size for the back up light across all listed model years, spanning 2003-2009.
The 3157 is an ANSI-standardized bulb type, meaning its specifications are governed by a formal industry standard recognized in both the United States and Canada.
The 3157 is a dual-filament bulb, containing two separate filaments within a single housing that operate at different wattages: 27W for the higher-intensity filament and 7W for the lower-intensity filament.
The bulb operates on a 12-volt electrical system, which is consistent with the standard automotive electrical architecture found in passenger vehicles and light trucks.
The 3157 follows a T25 wedge-style form factor, referring to the shape of the plastic base that secures the bulb into the socket without requiring a separate metal bayonet or screw base.
Because the 3157 is a dual-filament type, substituting it with a single-filament equivalent such as the 3156 would result in the loss of one functional circuit, making filament count a critical factor in replacement compatibility for the Hummer H2 (2003-2009).