Chevrolet Camaro Turn Signal Bulb Size

Additional Notes

• The 2057 bulb is the most frequently specified size across the Chevrolet Camaro's turn signal history, covering the front position from 1984 to 1990 and the rear position from 1984 to 2002. It uses a BAY15d bayonet base, operates at 12V with a dual-filament output of 26.9W/8W, and is described as a brighter variant of the 1157.
• The 7440NA is the front turn signal bulb for the Camaro across the 2016-2018 and 2021-2024 model years. It is a single-filament T20 wedge bulb rated at 12V and 21W, with natural amber glass that produces the amber color required for turn signals without relying on a tinted lens or housing.
• The 1157 bulb, a dual-filament BAY15d type rated at 12V and 21W/5W, serves as the rear turn signal bulb for the Camaro from 1967 to 1983. Its two filaments allow it to function as both a turn signal and a running or parking light within a single housing.
• Natural amber variants, designated by the "NA" suffix, are present across multiple bulb families in these specifications, including the 7440NA, 3457NA, 3357NA, 2057NA, 1034NA, and 1157NA. The amber tint is built into the glass envelope itself rather than applied through the lens, which is a recognized method for meeting amber turn signal color requirements.
• The 1034NA and 1157NA bulbs share the same BAY15d bayonet base and 12V/21W/5W electrical ratings, making them electrically similar. However, they carry distinct ANSI part numbers, and the specifications treat them as separate fitments across different Camaro model years from 1967 to 1979.
• The rear turn signal fitment for the 2016-2018 Camaro (Chevrolet Camaro) is conditional, with the 7440 bulb applying specifically to trims equipped with Halogen Capsule Headlamps. The 2015-2014 rear fitment similarly specifies the 7443 only for trims with Halogen Headlamps, indicating that headlamp technology on these model years determines which rear turn signal bulb is correct.
• The 7440 and 7443 are both T20 wedge bulbs rated at 12V and 21W, but they differ in filament count. The 7440 is single-filament, while the 7443 is dual-filament at 21W/5W. Despite sharing the same T20 form factor, substituting one for the other would alter the circuit behavior of the lamp assembly.
• The 3157 and 3057 are both dual-filament T25 wedge bulbs rated at 12V and 27W/7W, sharing identical wattage ratings. They differ in their internal filament configuration and pin orientation, which means they are not universally interchangeable despite their similar electrical output.
• The 12961 rear turn signal bulb, specified for the 2021-2024 Camaro, is a Philips part number rather than an ANSI standard designation. It is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, which is considerably lower in wattage than the 7440 and 7443 bulbs used in earlier rear turn signal positions.
• The 2397, specified for the 1993 Camaro front turn signal, uses a BAY15d bayonet base and is described as a variant of the 1157. It is a dual-filament bulb at 12V, though no wattage figure is provided in the specifications. Its single-year fitment between the 2057NA years of 1991-1992 and the 3057 years beginning in 1994 reflects a distinct part number for that model year.