GMC Terrain License Plate Bulb Size

Additional Notes

• The GMC Terrain uses the 12961 bulb for its license plate lighting across the 2010-2024 model years, with the exception of 2022, which is not present in the specifications.
• The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, rated at 12 volts and 5 watts.
• The T10 designation refers to a tubular bulb roughly 10mm wide, commonly used in low-intensity automotive applications such as license plate, courtesy, and parking lights.
• The W2.1x9.5d base is a wedge-type connector, meaning the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
• At 5 watts and 12 volts, the 12961 draws approximately 0.42 amperes, which is consistent with standard low-power incandescent miniature bulbs used in exterior accent positions.
• The W2.1x9.5d base is a specific wedge standard, and substitution with physically similar T10 bulbs carrying a different base code may result in fitment or electrical contact issues.
• Because the same bulb size is specified across all listed model years of the GMC Terrain, replacement parts sourced for one model year are electrically and physically interchangeable with those for any other listed year.