I have had several mechanical problems, not just electrical/electronic stuff. Front hub, rear wheel seals, NOX sensors, turbo actuator, intake. Just the cost of replacing the turbo actuator probably paid for more than half of my warranty. But like I say, my truck just might be somewhat more problematic than others. At whatever point I trade it in for a new one, I will buy an extended warranty again. All maintenance done by the book, at a dealer that services a ton of these trucks. I think they are pretty good.