A method of accurately maintaining, in position registers of memory modules, a net count of rotor signals received from a motor equipped with a rotor position sensor. A vehicle apparatus includes the memory modules and motor, as well as a driven component and processors that: (a) adjust the net count while the motor is driven; (b) monitor for, and terminate power upon encounter of, a mechanical stop; and (c) correct the net count for rotor signals received thereafter. Storage media and memory modules are encoded with processor instructions and processor-readable code that, when executed by processors, cause them to perform the method.