SilverLaw99

I’m going to show you how to fix the issue in GTA V or LSPDFR where you can’t enter certain vehicles. Don’t worry, it’s an easy fix. You’ll just need OpenIV.
 
First, open up openiv and make sure you’re in Edit Mode by clicking the Edit Mode button at the top.
 
Now, go to:
mods > update > update.rpf > common > data > levels > gta5
 
look for the file called vehicles.meta. Right-click it, and then click Edit
 
Click the search button at the top, and type in your vehicle’s model name. In my case it was sheriff2, but it will be whatever vehicle you’re having trouble with.
 
Now scroll down until you see <layout>.
By default, mine was set to LAYOUT_RANGER_SWAT.
You’ll want to change this to:
  <layout>LAYOUT_STANDARD</layout>   This makes the game treat the vehicle like a normal car so you can actually get inside it.   Next, look for the line that says <allowJoyriding>.
Change it so it looks like this:
<allowJoyriding value="true"/> This tells the game the vehicle can be entered normally.
 
Then save the file and hop back in-game, and that’s it!