Chevrolet Camaro Daytime Running Light Bulb Size

Chevrolet Camaro daytime running light bulbs utilize 2 distinct sizes: 12278 and 12277, with each bulb size corresponding to specific vehicle configurations. The replacement chart covers 2010 through 2015 model years and details the bulb size specifications for each production year.

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
2012-2015	12278 (With HID Headlamps)
2010-2011	12277 (With HID Headlamps)

Bulb Specifications

Description	Bulb Size
Philips part number. Single-filament halogen bulb with PG18.5d-3 base. 12V, 26W.	12278
Philips part number. Single-filament halogen bulb with PG18.5d-1 base. 12V, 13W.	12277

Other Locations

Additional Notes

The Chevrolet Camaro daytime running light specifications cover the 2010-2015 model years, all of which require HID headlamp fitment for the listed bulb sizes to apply.
Two distinct bulb sizes appear across these model years: the 12278 for 2012-2015 and the 12277 for 2010-2011, both carrying Philips part numbers.
Both the 12278 and 12277 are single-filament halogen bulbs operating on a 12-volt system, making them low-voltage components standard in automotive electrical architectures.
The 12278 is rated at 26W, while the 12277 draws only 13W, meaning the later 2012-2015 Camaro daytime running light consumes twice the wattage of the earlier unit.
Although both bulbs share the PG18.5d base family, the 12278 uses a PG18.5d-3 base and the 12277 uses a PG18.5d-1 base. These two base variants are not interchangeable despite their similar designation.
The PG18.5d base type is a plastic-bodied, push-and-turn style base commonly associated with compact daytime running light and parking light applications in European-influenced vehicle designs.
The base suffix difference between the PG18.5d-3 and PG18.5d-1 indicates a distinct pin or locking tab configuration, which physically prevents cross-installation between the two bulb types.
Because the Chevrolet Camaro transitioned from the 12277 to the 12278 between the 2011 and 2012 model years, owners of vehicles near that production boundary should confirm the exact model year before sourcing a replacement bulb.