Spent 8 hours on a phantom 'door zone' fault in a 90s Otis Gen2

Everyone says to trust the diagnostic codes, but this one was a total red herring. The car kept stopping inches high, flashing a door zone error, but all the sensors and sills were perfect. Turns out a worn sheave was letting the rope slip just enough to mess with the absolute position encoder. Replaced the sheave and the code cleared instantly. Has anyone else had a Gen2 lie to them like that?

3 comments

3 Comments

jake_torres6811d ago

Yeah, heard a similar story where a bad encoder coupling gave a totally wrong zone fault on an old Otis. Those Gen2 systems can get real creative with their error codes when something mechanical wears out. Always ends up being a physical problem masquerading as a sensor issue.

henderson.oscar11d ago

But isn't that just the system doing its job by pointing you to the area of the fault, even if the root cause is mechanical?

jana_scott9d ago

Jake's right, those old systems love to blame a sensor for a worn-out part.