Chrysler Pacifica Back Up Light Bulb Size

Additional Notes

• The Chrysler Pacifica backup light specifications cover two distinct bulb types across the model years listed: the 7440 and the 921.
• Both the 7440 and the 921 are ANSI-standardized wedge-base bulbs rated at 12 volts, making them compatible with standard automotive electrical systems in the United States and Canada.
• The 7440 is a T20 single-filament wedge bulb rated at 21 watts, while the 921 is a T15 wedge bulb rated at 16 watts. The T designation refers to the tubular shape of the glass envelope, with the number indicating its width in eighths of an inch.
• The wattage difference between the two bulbs is notable: the 7440 draws 21 watts versus the 921's 16 watts, meaning the two types are not electrically interchangeable despite both being single-filament wedge designs.
• The Chrysler Pacifica (2017-2024) uses the 7440 bulb for the backup light position.
• The 2004-2008 Pacifica uses the 921 bulb for the same backup light position, reflecting a different socket and wattage requirement from the later generation.
• The T20 and T15 designations indicate physically different envelope sizes, which means the socket housings for the 7440 and 921 are not the same, and substituting one for the other is not supported by these specifications.
• A gap exists in the listed model years between 2008 and 2017, and no bulb size data is provided for that interval within these specifications.