Chevrolet Suburban Back Up Light Bulb Size

Chevrolet Suburban back up light bulb sizes include 921, 7441, and 3157 specifications across multiple generations. The replacement chart covers vehicle production from 1969 through 2023.

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

Years	Bulb Size
2015-2023	921
2007-2014	7441
2001-2006	3157
2000	2456 (Early Model)
2000	3157 (Late Model)
1998-1999	3156
1993-1997	2456
1992	3156
1977-1991	1156
1975-1976	199
1969-1974	1156

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.	921
ANSI standard (US & Canada). Single-filament wedge bulb (T20), amber. 12V, 21W.	7441
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 21W.	199

Other Locations

Additional Notes

The 1156 bulb is the most frequently specified size across the Chevrolet Suburban's back up light history, covering model years 1969-1982, 1983-1984, and 1985-1992 with some interruptions, making it the dominant fitment across the vehicle's lifespan. It uses a BA15s bayonet base and operates at 12V, 21W with a single filament.
The 921 is a T15 wedge bulb rated at 12V and 16W. It is the specified back up light bulb for the Chevrolet Suburban across the 2015-2023 model years.
The 7441 is a T20 single-filament wedge bulb rated at 12V and 21W. It is amber in color and serves as the specified fitment for the 2007-2014 model years.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W primary filament and a 7W secondary filament. It is specified for the 2001-2006 model years, as well as the late-production 2000 model.
The 3156 is a single-filament T25 wedge bulb rated at 12V and 27W. It shares the same T25 housing as the dual-filament 3157 but carries only one filament, and it is specified for the 1992, 1998, and 1999 model years.
Because the 3157 and 3156 share the same T25 wedge base, the 3157 is physically interchangeable with the 3156 socket. However, substituting a dual-filament 3157 in place of a single-filament 3156 application introduces an unused filament circuit, which may not be appropriate for all installations.
The 199 bulb uses a BA15s bayonet base and is rated at 12V and 21W, making it electrically equivalent to the 1156. It is listed as a variant of the 1156 and is the specified fitment only for the 1975-1976 model years on the Suburban.
The 2456 is a festoon-style bulb rated at 12V and designated for specialty applications. It is specified for the 1993-1997 model years and the early-production 2000 model, distinguishing it from the wedge and bayonet types used in surrounding years.
The 2000 model year Chevrolet Suburban carries two distinct back up light bulb specifications: the 2456 for early-production units and the 3157 for late-production units. This split indicates a mid-year production change and means the correct fitment depends on when the specific vehicle was manufactured.
The 7441 is noted as an amber bulb, which is atypical for a back up light application, since back up lights are conventionally white. Installers should account for this color characteristic when sourcing replacement bulbs for the 2007-2014 Suburban.