This is probably only an option in some aftermarket alarm systems, but there may be a switch hidden near the driver’s feet to shut off the alarm. If this doesn’t work, use the physical key (every key fob should have one tucked inside) to lock and unlock the car door. Try using the lock and/or unlock buttons on the key fob to remotely stop the alarm. Sometimes simply getting into the car and turning it on with your normal key or fob is enough to stop the alarm. How Much Will it Cost to Fix My Car Alarm Issue?Īssuming you’ve tried the key fob alarm button and it didn’t work, there are a few strategies to try to stop that terrible shrieking.7) Incorrectly Installed Alarm System or Faulty Alarm Module.5) Dirty or Malfunctioning Door Lock or Trunk Sensor.3) Corroded, Rusty, or Dirty Battery Terminals.