Actually, even now the car can not be towed if it is out of power. To tow, you need at least a booster battery to boot the 12v systems in the car. Or you need

Actually, even now the car can not be towed if it is out of power. To tow, you need at least a booster battery to boot the 12v systems in the car. Or you need to lift it. Not a problem for an road assistance service, but potentially irritating if you are on your own. The traction battery does not have to be online though.