[gmak]

It's hard to answer your question. As you've said, the best thing is to get under there and look at the wiring and plug. If you're doing any heavily-wet condition driving then a little dielectric grease on the outside edge of the plug can help keep moisture out of the circuit.

 

[gmak]

Very comprehensive. Fingers crossed that this takes care of any issues. Often it's the little things that lead to the bigger solution. Sometimes I put a little bead of dielectric grease around the edge of a plug (the one that the other piece goes into) to help seal out moisture.

Reminds me of an analog situation I had. Briefly: Years of tick tick tick in a 528i, finally only exhaust leak left as answer, indy to take off seized bolts and nuts on exhaust manifold flange - fries O2 sensors. Change O2 sensors - one was very easy to take out. Tick tick tick gone. No need to remove exhaust manifolds any more.

 

[gmak]

Many congratulations. I don't suppose that there is a diagram where you can circle the connections you cleaned and sprayed?

 

[gmak]

Question? Is the software version in the new ECU different than in the old one? Could you have had the same result by updating the old SMG ECU with the most recent software via the INPA suite of software? (NCS expert etc).

What I'm trying to figure out is if it was a hardware or software issue at the heart of this problem.

Thanks.