A vehicular driving control system and a method for operating the same are provided, may include an information provider to provide information on a front road of a vehicle, a transmission controller to control gear shifting by predicting a condition on the front road based on the information on the front road, and a diagnosing device to diagnose a failure status by verifying matching with the information on the front road, and to restrict a predictive gear-shifting controlling operation of the transmission controller, according to a result of the diagnosing.