Chevrolet Trailblazer Headlight Bulb Size

Chevrolet Trailblazer headlight bulbs utilize H9 and 9005 sizes for high beam applications, while low beam configurations employ 9005 and 9006 bulb sizes. The replacement chart covers vehicle production spanning 2002 to 2023 with corresponding bulb size specifications.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

High Beam Headlight

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

Years	US Type	EU Type	Shop
2023	H9	H9	Check Price
2021	H9	H9	Check Price
2002-2005	9005	HB3	Check Price

Low Beam Headlight

Years	US Type	EU Type	Shop
2023	9005	HB3	Check Price
2021	9005	HB3	Check Price
2002-2005	9006	HB4	Check Price

Bulb Specifications

Description	Type	Shop
ECE standard (Europe & worldwide). Single-filament halogen bulb with PGJ19-5 base. Also approved in the US. 12V, 65W.	H9	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P20d base. 12V, 65W.	9005	Check Price
ANSI standard (US & Canada). Single-filament halogen bulb with P22d base. 12V, 55W.	9006	Check Price

Other Locations

Additional Notes

The 9005 bulb appears across both high beam and low beam positions in the Chevrolet Trailblazer specifications, making it the most frequently referenced bulb type overall. It follows the ANSI standard used in the US and Canada, operates on a 12V, 65W rating, and uses a P20d base with a single filament.
The 9006 bulb is specified for the low beam headlight position on the 2002-2005 Trailblazer. It is also an ANSI-standard single-filament halogen bulb running at 12V but draws 55W, which is 10 watts less than the 9005. It uses a P22d base, which differs physically from the P20d base of the 9005.
The H9 bulb is specified for the high beam headlight on the 2021 and 2023 Trailblazer. Unlike the 9005 and 9006, the H9 follows the ECE standard used in Europe and worldwide, though it carries US approval as well. It operates at 12V, 65W, and uses a PGJ19-5 base.
The base types across these three bulbs are all distinct. The H9 uses a PGJ19-5 base, the 9005 uses a P20d base, and the 9006 uses a P22d base. These differences mean the bulbs are not physically interchangeable with one another despite some sharing the same wattage rating.
The 2021 and 2023 Trailblazer use a mixed-standard headlight configuration, pairing an ECE-standard H9 in the high beam position with an ANSI-standard 9005 in the low beam position. This combination of regulatory standards within a single vehicle is a notable fitment detail.
The 2002-2005 Trailblazer uses a consistent ANSI-standard configuration across both headlight positions, with the 9005 in the high beam and the 9006 in the low beam. Both positions use single-filament halogen bulbs, meaning each function is handled by a separate dedicated bulb rather than a dual-filament unit.