Chevrolet Equinox Tail Light Bulb Size

Additional Notes

• The 3157 bulb is the most frequently specified tail light bulb across the Chevrolet Equinox's history, covering model years 2010-2015. It is a dual-filament T25 wedge bulb rated at 12V with a high filament draw of 27W and a low filament draw of 7W, following the ANSI standard for the US and Canada.
• The 2057 bulb was used across the 2005-2009 Equinox. Unlike the other bulbs in these specifications, it uses a BAY15d bayonet base rather than a wedge-style base, making it physically incompatible with sockets designed for wedge-type bulbs.
• The 7443 is a dual-filament T20 wedge bulb rated at 12V, 21W/5W. It appears in the 2016-2017 Equinox as a single fitment and also in the 2018 model year specifically for vehicles equipped with Halogen Capsule Headlamps.
• The 7440 and 7443 share the same T20 wedge form factor and voltage rating, but the 7440 is a single-filament bulb at 21W while the 7443 carries dual filaments at 21W/5W. In the 2020 Chevrolet Equinox with Halogen Capsule Headlamps, the specification calls for the 7440, not the 7443, which distinguishes it from the 2018 halogen variant.
• The 194 is a miniature T10 wedge bulb rated at 12V and 3.78W, the lowest wattage among all bulbs listed in these specifications. It is specified for the 2019 Equinox and for the 2018 and 2020 model years when the vehicle is equipped with HID Headlamps.
• The 2018 Chevrolet Equinox requires two different tail light bulbs depending on headlamp type: the 194 for HID Headlamp-equipped vehicles and the 7443 for those with Halogen Capsule Headlamps. The same headlamp-dependent split applies to the 2020 model year, where the 194 corresponds to HID and the 7440 to Halogen Capsule fitments.
• The 2057 is described as a brighter variant of the 1157, sharing the same BAY15d bayonet base. Despite the physical similarity to the 1157, the two are not identical in output, and substituting one for the other may result in differing brightness levels.
• All bulbs in these specifications conform to the ANSI standard applicable to the US and Canadian markets, and all operate at 12V, consistent with standard automotive electrical systems.
• The transition from the 2057 bayonet-base bulb to the 3157 wedge-base bulb between the 2009 and 2010 model years represents a socket-type change, meaning the two bulbs are not interchangeable despite both being dual-filament designs.
• The 3157 and 7443 are both dual-filament wedge bulbs but differ in base size and wattage. The 3157 uses a T25 base with filaments rated at 27W/7W, while the 7443 uses a smaller T20 base at 21W/5W, making them incompatible with each other's sockets.