I've tuned dozens of trucks over the last 2 yrs with the ezlynk using CA or now CTT tunes and haven't had one issue. Fords Chevys Rams and Nissans. Tunes are great and there is many to choose from. Any changes have to be flashed so I dont see how anyone could hack into your truck but anything is possible these days. Most of my customers I flash and they drive away. Some want there own ezlynk for future changes but never any issues so far