A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM. The trike is set so lean that the rear cylinder isn't running right (?). Not positive on all the particulars, but he keeps getting the same code show up. They said they're pretty sure he'd be fine to just ride it, but he's worried about getting stuck up in the mountains and needing it towed if it stops running.
Has anyone else heard about or experienced this problem?
Side note: I bought my new 2018 the same week from the same dealership and have not had the problem....yet.