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Well, in my case the diagnosis is a bad trans. Dealer pulled codes from the TCU and transmitted them to BMW tech support. Tried a few more tests with and without the TCU hooked up from what I understand and the tech was able to get it to bang again. Transmitted that data to tech support and the decision was to replace the trans. Apparently between the 3-4 upshift hoot and the almost daily slow speed bang now means the trans has to be replaced.
I still don't know the data or codes that meant the trans was bad, and won't until probably next week when I get the X5 back. But the fact that the tech was able to reproduce the bang combined with the codes he pulled while driving were enough to make the diagnosis.
I'm glad I've got a CPO car and the trans is under warranty. If I'd bought this X5 new then the trans repair would be on my nickel (or Visa), but being a CPO car has it's benefits.
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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R
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05-29-2010, 08:30 AM
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