Chevrolet City Express Trunk Bulb Size

Additional Notes

• The Chevrolet City Express uses the 12961 bulb across all four model years covered by these specifications, spanning 2015-2018.
• The 12961 is a miniature wedge bulb operating at 12 volts and 5 watts, placing it in the low-power range typical of interior and cargo area lighting applications.
• The T10 designation refers to the bulb's tubular envelope size, where the number indicates a width of 10/8 of an inch.
• The W2.1x9.5d base is a wedge-type connector, meaning the bulb is held in place by the socket's tension against the glass envelope rather than by a separate metal base with pins.
• The 12961 in these specifications is a Philips part number, which identifies a specific manufacturer's version of the T10 W2.1x9.5d form factor rather than a universal industry bulb code.
• Because the T10 wedge base is a widely shared form factor, other bulbs carrying the same base type and voltage-wattage rating may physically fit the socket, though compatibility with the vehicle's electrical system depends on matching the 12V, 5W rating.