The Pontiac G6 high beam headlight uses an H9 bulb size while the low beam headlight requires an H11 bulb size. Replacement chart data covers 2005 to 2010 model years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac G6 uses the H9 bulb for high beam headlights across the 2005-2010 model years. The H9 is a single-filament halogen bulb operating at 12V and 65W, built to the ECE standard with a PGJ19-5 base, and carries approval for use in the United States.
Low beam headlights on the G6 across the same 2005-2010 span take the H11 bulb. Like the H9, the H11 is a single-filament halogen type governed by the ECE standard, though it draws less power at 55W and uses a PGJ19-2 base rather than the PGJ19-5 found on the H9.
The base types of the H9 and H11 are not interchangeable. The PGJ19-5 base of the H9 and the PGJ19-2 base of the H11 are physically distinct, meaning the high beam and low beam bulbs cannot be substituted for one another despite both belonging to the PGJ19 family.
Both the H9 and H11 operate on a 12V electrical system, which is standard across conventional passenger vehicles. The 10-watt difference between the two bulbs reflects their respective roles, with the higher-wattage H9 producing greater output suited to high beam use.