I had the identical issue of faulty shift position switch but with 3.0 the switch is inside the xm!

I was really not looking forward to remove the pan to get to the switch when [mention]srmmmm [/mention] mentioned I should check the connector for water.

It was full of rusty water. Cleaned it out, reset the codes and good to go.

I don't know if there is a similar connector on the V8 but definitely find out and if so clean it first. I think there might be a separate connector just for the position/selector switch since it's external.

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