In this time, ECU using in a car is increasing. Performance is too. ECU like using Navigation, GPS and Camera for vehicle is expended market share in a vehicle market. As a result, vehicle is no longer a stand-alone product. We should think about using new signal for robustness to each ECU. The increasing of ECU makes opportunities to improve robustness each ECU fail safe. This Study is talk about ESP’s fail safe and shows that how we take and make a chance and provide our customer improve their driving environment.