Car alarm goes off every time l open the door.

Did you get the key out? Does the alarm go off when you open every door or just the one? If you got it out and it only goes off when opening that one door, you may have an issue with the door lock or actuator on that door. There is a switch inside that could be malfunctioning. A hands-on inspection and some disassembly is required. If you don't work on your own car then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex