Chevrolet Colorado Headlight Bulb Size

Additional Notes

• The 9005 bulb is the most widely used high beam specification across the Chevrolet Colorado range, appearing in model years 2007-2012 and 2015-2024, as well as in 2004-2006 models equipped with halogen capsule headlamps. It is an ANSI-standard single-filament halogen bulb rated at 12V and 65W, fitted with a P20d base.
• The low beam circuit transitioned from the 9006 bulb to the H11 bulb between the 2012 and 2015 model years. The 9006 is an ANSI-standard single-filament halogen bulb with a P22d base rated at 12V and 55W, while the H11 operates under the ECE standard with a PGJ19-2 base at 12V and 55W.
• Although the 9005 and 9006 share a similar single-filament halogen construction and voltage rating, they use different base types, P20d and P22d respectively, which makes them physically non-interchangeable despite their comparable wattage profiles.
• The H11 carries ECE certification alongside US approval, meaning it meets a broader international regulatory standard than the ANSI-only 9005 and 9006 bulbs used elsewhere in the Colorado's headlight system.
• The Chevrolet Colorado (2004-2006) was offered with two distinct headlamp configurations: sealed beam and halogen capsule. Each configuration requires a different bulb type, and the correct replacement depends entirely on which system is installed on the vehicle.
• The H6054 is a 5x7-inch rectangular sealed beam unit conforming to the ANSI standard. Unlike the other bulb types in these specifications, the H6054 is not a replaceable capsule; the entire sealed unit is replaced as a single assembly when it fails.
• The 2024 high beam specification lists the 9005, while the 2024 model has no corresponding low beam entry in these specifications. The 2023 model lists both the 9005 for high beam and the H11 for low beam, representing the most recent year with both positions documented.