[Jstylezzz]

pawn Код:

CMD:vehicle(playerid,params[])
{
    new Float:x, Float:y, Float:z;
    GetPlayerPos(playerid,x,y,z);
    new vehicle = CreateVehicle(411, x, y, z, 90, 0, 1, 60);
    PutPlayerInVehicle(playerid,vehicle,0);
    return 1;
}

This is one of the correct usages of the function. If you know the vehicleid, you can use it there too (like Konstantinos said, there's a difference between the modelid and vehicleid).