I'm going to chime in on this thread. I installed the Vitesse around April 2020. Everything had been working great until one time this summer, just as I had packed up the family to go on a weekend trip, the dash lit up with check engine, service ignition, service this, service that, and the truck went into limp mode. I pulled over, shut it down for a minute, and then started it back up. The codes went away and the truck started right up in normal mode, albeit with the check engine light still on. However, it ended up going away later that day, and I thought nothing of it.
Fast forward to yesterday when randomly while going around a curve to merge onto a highway onramp - same situation. Dash lit up exactly as before and truck went into limp mode. So once again I pulled over and shut it off, waited for a minute, and turned it back on. Once again, the codes went away but the check engine light remained. Drove it on home, and right as I was pulling down my street the codes all reappeared again and I limped it into the garage. Since I was home, I thought I would just park it and check again this morning. This morning when I started it up, no codes but still have the check engine light.
As much as I love the Vitesse, I think I may take it off for a while. I had a Sprint Booster on my last vehicle and never had one problem. Maybe I am getting what I deserve for going the cheap route with the Vitesse.