The Plymouth Sundance brake light requires a 2057 bulb size for proper installation and function within the rear lighting assembly. Data for the specified vehicle covers the period from 1987 through 1994.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Plymouth Sundance uses the 2057 bulb for brake lighting across all model years from 1987-1994.
The 2057 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with filaments drawing 26.9W and 8W respectively, where the higher wattage filament activates for braking and the lower wattage filament serves a secondary function such as running lights.
The 2057 is an ANSI-standard bulb, meaning it conforms to specifications recognized in the United States and Canada.
The 2057 is described as a brighter variant of the 1157, which shares the same BAY15d base type, making physical fitment possible between the two, though their wattage outputs differ.
The center high mount stop light (CHMSL) on the Plymouth Sundance uses three different bulb types across its production run, specifically the 921, 922, and P21W.
The 921 and 922 are both T15 wedge bulbs rated at 12V and 16W under the ANSI standard, and their shared specifications indicate a high degree of interchangeability in practice.
The 1987 Sundance CHMSL uses the 921, while the 1988-1990 and 1992-1994 model years use the 922, and the 1991 model year specifies the P21W.
The P21W follows the ECE standard rather than the ANSI standard, reflecting a European and worldwide specification, and uses a BA15s single-contact bayonet base rated at 12V and 21W.
Because the P21W uses a BA15s bayonet base while the 921 and 922 use a wedge base, the 1991 Plymouth Sundance CHMSL socket is physically incompatible with the bulb types used in surrounding model years.