[Pawnie]

Try something like this

pawn Code:

CMD:vcolor(playerid,params[])
{
    new color[2];
    if(PlayerInfo[playerid][pAdmin] < 3)
    {
        if(sscanf(params,"ii",color[0],color[1])) return SendClientMessage(playerid,0xFFFFFFFF,"Use: /vcolor [color1] [color2]");
        if(!IsPlayerInAnyVehicle(playerid)) return SendClientMessage(playerid,0xFFFFFFFF,"You need to be in vehicle to use this command!");
        ChangeVehicleColor(GetPlayerVehicleID(playerid),color[0],color[1]);

    }
    return 1;
}

The problem should be here

Code:

if(sscanf(params,"ui", color1, color2))

Change ui to ii