Chevrolet Colorado Stepwell Bulb Size

Additional Notes

• The Chevrolet Colorado uses the 168 bulb for its stepwell position across the 2004-2012 model years.
• The 168 bulb is an ANSI-standardized type, meaning its electrical and physical specifications are defined by a recognized North American standard applicable in both the United States and Canada.
• It belongs to the T10 miniature wedge family, a designation that refers to its base construction. A wedge base has no separate metal contacts; instead, the glass envelope itself is pinched at the bottom and held in place by tension within the socket.
• The 168 operates at 12 volts, which is consistent with standard automotive electrical systems.
• Its rated wattage is 4.9W, placing it among the lower-draw bulbs in typical automotive applications, a characteristic common to courtesy and interior lighting positions such as stepwells.
• The T10 designation indicates the bulb envelope is approximately 10 eighths of an inch wide, a sizing convention used in the ANSI miniature bulb classification system.
• The wedge base format of the 168 means it is not compatible with bayonet or screw-base sockets, and substitution requires a bulb sharing the same T10 wedge base configuration to ensure proper fitment.