A vehicle control system for an automatic transmission includes a range selector for outputting a range instruction signal representing the selected shift range and a range shifter for manually outputting a shift instruction signal, and a by-wire control part for controlling the change-over of the shift range according to the range instruction signal input from the range selector. The by-wire control part has a range control circuit, which uses the shift instruction signal input from the range shifter if the range instruction signal is abnormal while monitoring the range instruction signal input from the range selector.