The Model Y abruptly stopped in traffic creating a collision hazard and impact of the front of the vehicle. The vehicle was completely disabled and had to be towed. Upon inspectiong by the Tesla service, the Power Conversion System had failed for the rear motor system which is part# ASSEMBLY - FRONT VEHICLE CONTROLLER GENERATION 3.1(1583991-10-D). The attached document has links to other owners with the same complaint. Also attached is the Tesla repair estimate which as can be seen has nothing to do with a rear end collision as it is replacing the front power conversion system.