Woo, the first problem I've ever had with GTA 5. Quite different from 4. So, I have a custom model in the sheriff/sheriff_hi slot. When I go into GTA, the vehicle itself has lights that work, etc, but the siren doesnt work when I press E, and when I hold E it just has the default sedan horn (NOT the default police one)instead of the police one. This only happens with this slot. It doesn't matter what vehicle model I put in there. I think it has to do with a .meta file. It's like the game doesnt register it's a police car, but the lights work. Can anyone help me out?