Philadelphia, PA Noise from Specific Sources: Car Alarm Limits (2026)

Section 12-1123, part of the Traffic Code's motor vehicle chapter, targets alarms that keep blaring after the initial theft-deterrent burst has done its job. Subsection (1) makes it unlawful to park a vehicle on a public highway or on private property with an audible anti-theft alarm in operation unless the device is built and programmed to automatically terminate within five minutes of activation; the Code goes further and separately deems any alarm that actually sounds continuously for more than five minutes a violation in its own right, so a compliant device that malfunctions and keeps sounding still exposes the owner. Subsection (2) targets motion-triggered systems: an owner may not park with an alarm capable of activating without direct physical contact to the vehicle, unless the owner triggers it remotely, such as with a key-fob panic button.

Because Section 12-1123 is one of the sections carved out of the standard $10-$50 magistrate fine schedule in Section 12-1129, a violation instead routes through Chapter 12-2800, the same civil-ticket process used for parking violations. Section 12-2809(2) fixes the base civil penalty for "Unlawful Vehicle Alarm" at $100. A recipient who fails to answer a notice of violation within ten days, or fails to appear at a hearing under Section 12-2807, owes an additional $30 in costs and fees, and a further $35 late fee attaches if payment is not made within thirty days of a final order. The Philadelphia Parking Authority processes and adjudicates these tickets the same way it does for a parked-on-the-sidewalk or expired-meter citation, rather than sending the case to Traffic Court.