What is the cause of the Volkswagen U010000 fault code?

[MilesLee]

Fault code U010000 indicates a loss of communication with the Engine Control Module (ECM)/Powertrain Control Module (PCM) A. Network fault: This is a fault in the multiplex communication system (i.e., a network fault). In this case, it is necessary to measure the wiring harness of the multiplex communication system according to the circuit diagram to check for any short circuits to the vehicle body ground or to the positive terminal. Measure whether the resistance value is within the standard range, and then also measure whether the terminal resistance value is normal. Functions of the automotive electronic control unit: The automotive electronic control unit is the core component of the electronic control system, receiving input signals from sensors or other devices and processing the input signals into signals that the computer can accept.