I thought my range switch was at fault. All symptoms pointed to it.

I was about to pull the bottom off my trans to dig out the switch (3.0 motors the switch is inisde) when it was suggested to look into the main connector on the back of the transmission.

Sure enough it was filled with rusty water shorting out the pins and giving literally random positions of the gear box.

(My dash literally told me I was in 54th gear at one point).

Check your connections from transmission to EGS box.

The wiring can go bad on the harness on the inisde and one other failure I've seen is when transmission is put together, the harness socket was not installed correctly and was inset too deep for the connector to reach all the pins.

Reading live data from the transmission I would get completely bizarre results from L1-L4 that was the key. I was thinking that had to be the position switch is dead, turned out to be rusty water in the connector.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)