Electrical stuff that makes the engine run (or not) is part of the "powertrain". There are federal laws for long warranties on anything affecting exhaust emissions too.
Subject to interpretation by dealer. I had a POS Tundra for a work truck at my last job. There was some cable that flexed that they'd cut corners and made it about an inch too short and after a while conductors would break causing all sorts of odd problems.
Warranty claims denied. According to them it was an "electrical problem" not drivetrain so it wasn't covered at that mileage. Since the repairs weren't coming out of my pocket I didn't contest it, but it did make my already low opinion of this company even lower.