The Chevrolet Kodiak headlight bulb specifications include H6054 and H4651 sizes for high beam applications, along with H6054, H4652, and H4656 sizes for low beam configurations. A replacement chart documents bulb size data spanning 1997 through 2009 for this vehicle model.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Kodiak uses sealed beam headlight units across its entire model range from 1997-2009. Sealed beam units integrate the filament, reflector, and lens into a single assembly, meaning the whole unit is replaced rather than an individual bulb.
The H6054 is a 5x7-inch rectangular sealed beam unit operating at 12V. It serves as both the high beam and low beam headlight on 2-headlamp configurations of the Kodiak from 1997-2009, as well as the sole headlight type on all model years from 1997-2002.
The 4-headlamp configuration, introduced on the Kodiak from 2003-2009, separates high and low beam functions into distinct sealed beam units. This contrasts with the 2-headlamp setup, where the H6054 handles both functions.
The H4651 and H4652 are both 4x6-inch rectangular sealed beam units operating at 12V. The H4652 is a variant of the H4651. On 4-headlamp Kodiak models, the H4651 is designated for high beam use and the H4652 for low beam use during 2007-2009.
The H4656 is a 4x6-inch rectangular sealed beam unit at 12V, used exclusively as the low beam in 4-headlamp configurations on 2003-2006 models. It was replaced in that role by the H4652 starting in 2007.
All four sealed beam types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating dimensional and electrical standardization across those markets.
The H4651, H4652, and H4656 share the same 4x6-inch rectangular form factor, but they are not interchangeable. Each carries a distinct ANSI designation corresponding to a specific beam function, and substituting one for another would not satisfy the correct optical output requirements.
The headlamp system configuration of a given Kodiak, whether 2-headlamp or 4-headlamp, is a critical fitment factor. The same model year requires different bulb sizes depending on which configuration is present, making configuration verification necessary before replacement.