Chevrolet Silverado Trunk Bulb Size

Additional Notes

• The 912 bulb is the sole bulb type listed across all model years in these specifications, serving the open trunk position on the Chevrolet Silverado from 2007-2014.
• The 912 is classified as a T15 wedge bulb, meaning it uses a wedge-shaped base rather than a pin or bayonet fitting, which allows it to be inserted directly into a socket without rotation.
• Operating at 12 volts and 12 watts, the 912 draws a modest amount of power, consistent with its role as a cargo or trunk illumination bulb rather than a high-output lighting source.
• The 912 follows the ANSI standard recognized in both the United States and Canada, placing it within a standardized North American bulb classification system.
• The 912 is a variant of the 921 bulb. While both share the T15 wedge form factor and 12-volt rating, the 921 operates at a higher wattage of 18W, making the two bulbs electrically non-identical despite their physical similarities.
• Because the 912 and 921 differ in wattage, substituting one for the other may affect socket load and is a fitment consideration when sourcing a replacement.
• For the 2014 Chevrolet Silverado, the 912 open trunk bulb specification applies exclusively to the 2500 and 3500 HD trims, distinguishing those configurations from other variants of that model year.