Cadillac Escalade EXT Back Up Light Bulb Size

The Cadillac Escalade EXT back up light utilizes 7441, 2458, and 3157 bulb sizes depending on the specific version of the vehicle. Data for the bulb sizes covers the range from 2002 through 2013.

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
2007-2013	7441
2002-2006	3157

Bulb Specifications

Description	Bulb Size
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

Other Locations

Additional Notes

The Cadillac Escalade EXT back up light specifications cover the 2002-2013 model years, with two distinct bulb types used across that span.
The 7441 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W, and is amber in color.
The 3157 is an ANSI-standard dual-filament wedge bulb in the T25 form factor, rated at 12V with a dual-wattage output of 27W and 7W corresponding to its two filaments.
The Cadillac Escalade EXT (2007-2013) uses the 7441 bulb for the back up light position.
The 2002-2006 model years use the 3157 bulb instead, making 2007 the point at which the specification changed.
The T20 and T25 designations refer to the wedge base size, with T25 being physically larger than T20, which means the 7441 and 3157 are not interchangeable despite both being wedge-type bulbs.
The single-filament design of the 7441 contrasts with the dual-filament design of the 3157, meaning the two bulbs serve different electrical configurations and cannot substitute for one another even if a physical fit were possible.
Both bulb types conform to ANSI standards applicable in the United States and Canada, indicating consistent regulatory compliance across all listed model years.