GMC Savana Back Up Light Bulb Size

GMC Savana back up light bulbs utilize 3 different sizes: 3157, 1156, and 1141, with the outer back up light bulb size specified as 3157. The replacement chart contains vehicle production years and bulb size specifications spanning from 1996 to 2024.

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

Back Up Light

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
2003-2024	3157	P27/7W	Check Price
2001-2002	1156	P21W	Check Price
1999-2000	1141	1141	Check Price
1998	1156	P21W	Check Price
1996-1997	1141	1141	Check Price

Outer Back Up Light

Years	US Type	EU Type	Shop
2017-2018	3157	P27/7W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Dual-filament wedge bulb (T25). 12V, 27W/7W.	3157	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1156	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.	P21W	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1141	Check Price

Other Locations

Additional Notes

The GMC Savana uses the 3157 bulb for its back up light across the 2003-2024 model years, making it the most consistently specified bulb type in these fitment records.
The 3157 is a dual-filament T25 wedge bulb rated at 12V with a 27W bright filament and a 7W dim filament, conforming to ANSI standards recognized in both the United States and Canada.
Because the 3157 carries two filaments, it is capable of serving multiple lighting functions within a single housing, which is a common reason this bulb type is specified in combination lamp assemblies.
The 1156 bulb was specified for the GMC Savana back up light in the 1998, 2001, and 2002 model years. It is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W.
The 1141 bulb was specified for the 1996, 1997, 1999, and 2000 model years. Like the 1156, it is a single-filament bulb with a BA15s bayonet base rated at 12V and 21W.
Although the 1156 and 1141 share the same BA15s bayonet base and identical voltage and wattage ratings, they are distinct ANSI part numbers and are not confirmed as interchangeable within these specifications.
The 3157 uses a wedge-style base, which is physically incompatible with the BA15s bayonet base found on the 1156 and 1141 bulbs. Substituting one type for the other is not supported by these specifications.
For the 2017-2018 GMC Savana, the outer back up light position is separately specified and also uses the 3157 bulb, indicating that both the standard and outer back up light positions share the same bulb type in those model years.