Chevrolet Blazer Cornering Bulb Size

The Chevrolet Blazer cornering light utilizes 921, 2456, and 3156 bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 1995 to 2022.

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

Bulb Size by Year Range

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
2022	921	W16W	Check Price
1997	2456	2456	Check Price
1996	3156	P27W	Check Price
1995	2456	2456	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921	Check Price
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456	Check Price
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156	Check Price

Other Locations

Additional Notes

The Chevrolet Blazer cornering bulb specifications reference three distinct ANSI-standard bulb types across the listed model years: the 921, the 2456, and the 3156, each carrying different physical forms and electrical ratings.
The 921 is a T15 wedge bulb rated at 12V and 16W. The wedge base design means the bulb is held in place by tension from the socket rather than by a bayonet or screw mechanism.
The 3156 is a T25 single-filament wedge bulb rated at 12V and 27W. Its wattage is notably higher than the 921, which reflects a greater light output suited to cornering illumination demands.
The 2456 is a festoon-style bulb rated at 12V and is designated for specialty applications. Festoon bulbs are cylindrical in form and mount by contact pressure at each end rather than through a conventional socket base.
The 1996 Chevrolet Blazer uses the 3156, while the 1995 and 1997 model years both use the 2456. These two bulb types are not interchangeable due to differences in base design, physical form, and wattage.
The 921 and 3156 are both wedge-base bulbs but belong to different size classes, T15 and T25 respectively, meaning they are not cross-compatible despite sharing the same base style.
All three bulb types conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across those markets.