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I am suffering from the no reverse light/mirror dipping and would like to test and/or change my back-up switch prior to concluding that I’m suffering from an internal failure. I’ve removed the tray and believe that I located the switch and removed the plug on the drivers side of the transmission. Can someone please confirm? Photos attached. I couldn’t find a single photo of the switch online. My car is MY 2013 C2S with 7MT.
My dealer says part is not in stock in US and will take 3-4 weeks from Germany, so I’d like to test my existing instead of just waiting. I believe I can test if I remove by manually pushing in the piece to activate (is that right?).
Also, this may be a stupid question, but do I need to drain the transmission fluid to remove the switch and/or will fluid come out when I remove? The switch is lower on the transmission then I expected (if I have the right one) and I’m not sure. Have never worked on transmission aside from changing fluid.
Your help is appreciated. I couldn’t find any DIY, so I’ll create one once I get this all figured out.
Yes - I will take to an independent if the damage is internal to ask them to wire up a micro switch. Want to try ensure that its not a bad back-up switch first since so many on the prior generations failed. I think i would be the first 991.1 if its just the switch, but worth checking before bypassing the switch.
I wonder if the actuator inside is bent slightly and fails to move the switch enough to make a contact.
can you look inside and see anything?
I don’t have any way to look inside do to the location. I believe in the other 3 cases posted here the actuator actually broke off. I suspect that’s what happened to me. The other day I couldn’t go into 2nd gear briefly. Also, my shifts felt more mechanical the last few days. I brushed it off at the time as colder weather. Either it’s a total coincidence or the piece broke off and was bouncing around on its way to the bottom of the transmission. After the 2nd gear issue, car has shifted perfectly.
I’ve contacted a local independent who specializes in Porsche/Audi. Will see if he has any repairs and/or will wire up a micro switch.
It breaks off entirely, has happened to so many of us
when it happens, how do you get the broken piece out from the inside? I read this thread and the other bigger thread about this issue, but now i cant remember if and where it was talked about removing the broken piece
when it happens, how do you get the broken piece out from the inside? I read this thread and the other bigger thread about this issue, but now i cant remember if and where it was talked about removing the broken piece
You can't, but I'd like to hope it's a small enough piece that it gets shredded up by the transmission pretty quickly
is it just two wires in that actuator? I am guessing when the circuit is completed by actuating the switch? Looks like the microswitch hack will be more and more common as MT cars get older. Even with the replaced transmissions I am guessing this can happen again.
is it just two wires in that actuator? I am guessing when the circuit is completed by actuating the switch? Looks like the microswitch hack will be more and more common as MT cars get older. Even with the replaced transmissions I am guessing this can happen again.
the back-up switch is just two wires, with only one function (off/on). There is a metal rod/button on the backside of the back-up switch that goes into the transmission - this is designed to compress and decompress when the transmission is shifted into and out of Reverse. The piece inside the transmission is apparently defective from ZF. A vehicle is not in reverse that often. No legitimate reason to break other than being defective by design or manufacturing. Maybe Porsche will goodwill more or design a more permanent fix if these continue to merge. In automatics I believe the switch is with the gear selector.
09-25-2020, 10:04 AM
991.1 MT Back-Up Switch
