GMC Sierra Back Up Light Bulb Size

GMC Sierra back up light bulbs utilize 921, 1156, and 3047 bulb sizes, with outer back up light positions requiring 1156 or 921 sizes. The replacement chart covers vehicle production years from 1999 through 2024.

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

Back Up Light

YearsBulb Size
2023-20241156 (1500 only)
921 (3500 HD only)
2022921
2021921 (With Fleetside)
1156 (Without Fleetside)
2014-2020921
2007-20133047
2000-20063157
19992456 (1500 only)
921 (2500/3500 only)

Outer Back Up Light

YearsBulb Size
20191156 (With Chassis Cab, 3500 HD only)
921 (Without Chassis Cab (ZW9), 3500 HD only)
2017-20181156 (1500 only)
1156 (With Chassis Cab, 3500 HD only)
921 (Without Chassis Cab (ZW9), 3500 HD only)

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1156
ANSI standard (US & Canada). Wedge bulb (T15). 12V, 16W.921
ANSI standard (US & Canada). Single-filament wedge bulb (T25). 12V, 27W.3047
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.3157
ANSI standard (US & Canada). Festoon bulb, specialty application. 12V.2456

Other Locations

Additional Notes