Hummer H2 front turn signal bulbs use 4157 size while rear turn signal bulbs use 3057 or 3157 size. The replacement chart covers 2003 to 2009 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 Hummer H2 uses two bulb types for its front and rear turn signals across the 2003-2009 model years: the 4157 for the front position and either the 3057 or 3157 for the rear position.
All three bulb types found in these specifications, the 4157, 3057, and 3157, share the same ANSI-standard T25 wedge form factor rated at 12V with a dual-filament output of 27W and 7W.
The dual-filament design of the T25 wedge bulb allows a single unit to serve two distinct brightness levels, which is typical in automotive applications where one filament handles turn signaling and the other handles a secondary function such as parking or running light duty.
The 4157 bulb is specified for the front turn signal of the Hummer H2 across all model years from 2003-2009 without variation.
The rear turn signal position shows a bulb change between model years. The 3157 is specified for 2003-2005, while the 3057 is specified for 2006-2009.
Although the 3057 and 3157 share the same T25 wedge base, voltage rating, and wattage values, they carry distinct ANSI part numbers and are not confirmed as interchangeable within these specifications.
All bulb types listed are recognized under ANSI standards applicable in both the United States and Canada.
The 27W filament in each of these bulbs represents the higher-output filament, consistent with the brightness level required for an active turn signal flash, while the 7W filament operates at a lower intensity.