A computer for a motor vehicle able to be electrically connected to a sensor of the vehicle over a wired communication link in order to receive an output signal generated by the sensor. The sensor being electrically powered by a power supply module via a wired power supply link. The computer is able to be electrically connected to a measurement device configured for measuring the variations in the electric current flowing through the wired power supply link, and it is configured for detecting a short-circuit on the wired communication link between the wired power supply link and the wired communication link, for receiving, from the measurement device, the measurements of the variations in the current flowing between the power supply module and the sensor and for estimating the output signal from the received current variation measurements.