After Trans oil Change/harsh downshift now

[andrewwynn]

Originally Posted by Rockit

Can you get a little more detailed please. The TCM is the same as the neutral safety switch? Does it unbolt or how to you clean it?

TCM is transmission control module in the e-box with the DME.

You are calling the transmission position switch the metal safety switch. It actually reports every gear not just park and neutral. I’ve been referring to it as the selector switch not sure where I heard that but I just looked it up on real oem. BMW calls it the transmission position switch.

Anyhow less than a week ago somebody on xo couldn’t start their x5 because the connector to their position switch was loose (the locking collar didn’t lock).

Since the TCM needs feedback of which gear is selected to determine how to control the transmission, all hell breaks loose when it reports strangeness like it’s in gear 54 which mind did once.



Note there is a connector after about 8” of wire that’s the position switch connector I don’t know if that goes directly toward the TCM or plugs into the transmission and piggy backs into the main transmission connector.

I have the 3.0 and it uses an internal position switch so I only have one connector.