Turrets target NPCS and shoot them but they do not die, I am using Raidable Bases and Zombie Horde too.

Server i have is PVE

This plugin does not influence how much damage turrets do, so another plugin is causing the problem where NPCs aren't taking damage from car turrets.

From my limited experience with PVE plugins, that they may block damage to certain entities if the plugin thinks a player is attempting to damage another player or their property. I see people are often confused about how to configure the plugin correctly for every situation.

To help determine the precise root cause, I suggest you try isolating and changing some variables in your experiments. For example, see if a normal turret deployed by a player will damage the same NPCs. Then try F1 spawning a turret and see if it will damage the same NPCs. This baseline will help determine whether ownership is at play, since player deployed turrets have an owner, which the PVE plugin might be factoring in. You can perform a similar test with car turrets, since turrets added to cars by players are owned, whereas turrets auto spawned on cars that spawn along the road are not owned.