Parking Sensors

A PDC (Park Distance Control) sensor is a small ultrasonic transducer mounted in the front or rear bumper — it emits high-frequency sound pulses and measures the echo bounce time to calculate the distance to obstacles, triggering an increasingly rapid beep as you get closer.

Common signs are a continuous warning tone the moment park assist activates, no tone at all, or a specific sensor position always reading an obstacle that isn't there — a single failed sensor often disables the whole system or throws a park-assist warning on the dash.

The same car model can use different sensor part numbers depending on year, trim and whether the system is front, rear or surround — the OEM part number stamped on the sensor or connector is the only reliable way to guarantee the correct frequency, connector and housing match.