I have this issue with a 99 Nissan altima. My xtool D7 won't read it, and neither will my Snap-on read the factory dtc's. But when I switch over to Global OBD2, my Snap-on will read it. I don't think the X tool supports the global OBD even though it probably relies on some of its information. However, I do have a cheap little 25.00 job like yours, and it will talk to my nissan , b😮ecause I think all they can do is read OBD2.
I had a D7 but it packed up after a short time just checking family cars, so had a refund and got the Autel MK808s, will be interested to know the outcome.
Mine's been great for a couple years, I'm guessing just a glitch in this latest Fiat update. One downside to pushing out updates as frequently as XTool does is that each one is an opportunity for a bug. They might be smarter to update more slowly.
