Chevrolet Tahoe Back Up Light Bulb Size

The Chevrolet Tahoe back up light utilizes bulb sizes 921, 7441, 3157, 3156, 2456, and 2356 depending on the specific version. Available data covers the range from 1995 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	7441
2001-2006	3157
2000	3156 (Early Model)
2000	3157 (Late Model)
1998-1999	2456
1997	3156
1996	2356
1995	2456

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). Single-filament wedge bulb (T25). 12V, 27W.	3156
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.	2456
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V.	2356

Other Locations

Additional Notes

The 921 bulb is a T15 wedge type rated at 12V and 16W. It serves as the back up light bulb for the Chevrolet Tahoe across the 2015-2023 model years, making it the most consistently specified bulb in these fitment records.
The 3157 bulb is a dual-filament T25 wedge type rated at 12V with a 27W high filament and a 7W low filament. It is specified for the Tahoe across the 2001-2006 model years. Because it carries two filaments, it is not a direct substitute for single-filament bulbs of the same base size, such as the 3156.
The 3156 is a single-filament T25 wedge bulb rated at 12V and 27W. It shares the same T25 wedge base as the 3157 but lacks the second filament. The 3156 is specified for the 1997 Tahoe and for early production 2000 models.
The 2000 Chevrolet Tahoe carries two distinct back up light bulb specifications depending on production timing. Early model units take the 3156, while late model units take the 3157. These two bulbs are not interchangeable due to the filament count difference, so production date is a relevant factor when sourcing a replacement.
The 2456 is a festoon-style bulb rated at 12V, noted for specialty application use. It is specified for the Tahoe in 1995, 1998, and 1999. The festoon form factor differs structurally from wedge and bayonet base bulbs, meaning it is not interchangeable with any of the other bulb types listed in these specifications.
The 2356 is a dual-filament bulb with a BAY15d bayonet base rated at 12V. It is specified for the 1996 Tahoe. The BAY15d bayonet base is a physically distinct mounting type from wedge bases, making the 2356 incompatible with sockets designed for T15 or T25 wedge bulbs.
The 7441 is a single-filament T20 wedge bulb rated at 12V and 21W, with an amber tint. It is specified exclusively for the 2007 Tahoe within these records. The amber coloring distinguishes it from the clear or white variants common to other bulb types listed here.
The T25 wedge base is shared between the 3156 and 3157 bulbs, but their filament configurations differ. Substituting a dual-filament 3157 into a socket wired for a single-filament 3156, or vice versa, risks incorrect circuit behavior even though the physical base fits.
Five distinct bulb types are specified across the Tahoe back up light fitment records: the 921, 3157, 3156, 2456, 2356, and 7441. Each uses a different base type or filament configuration, and none of these six types are universally interchangeable with one another.
All bulb types in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across the listed part numbers.