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#1
12-23-2015, 11:34 AM
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Transmission Fail Safe Mode Problem figured out!!
Frustration is an understatement when it comes to having you vehicle locked in transmission fail safe mode. My buddy and I scanned my X5 repeatedly trying to figure out where the problem was. We tested voltage and recognized the alternator wasn't putting out proper voltage so I pulled the alternator and my buddy pulled it apart only to find the 'rebuilt' alternator had the cheapest parts imaginable in it so he sourced good parts and replaced them. With the alternator working properly, we turned out attention to the ride height leveler not working properly throwing codes but while we had one of them out, I disconnected the battery, touched both positive and negative cables together draining any residual power and I pulled the ECU and the transmission ECU. This is where it gets interesting. I found corrosion on the pins of the transmission ECU so my buddy pulled it apart and found corrosion inside on some of the pins leading into two of the chips. He used Deoxit to clean them, then he put it back together and sealed it on the outside. I put it in last night and I now have a properly working X5 again. UNREAL!! One shop actually told me they advised me to replace the transmission!! I promptly told them that with it being only 2yrs old and having 16,000kms on it, I was positive it wasn't the transmission.
  
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If you can still see the disapointment on his face in your rear view mirror, he's not far enough behind. 98 M3 Sedan blk/blk Sold 00 BMW 540i Sold 03 BMW 4.6IS 98 BMW E36 M3 modified 
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#2
12-23-2015, 12:01 PM
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Where is this thing located that it got that much corrosion.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5
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#3
12-23-2015, 06:19 PM
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I never could have imagined water getting into the ECU box under the plastic cover just under the hood against the passenger side firewall, but somehow it managed to get there.
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If you can still see the disapointment on his face in your rear view mirror, he's not far enough behind. 98 M3 Sedan blk/blk Sold 00 BMW 540i Sold 03 BMW 4.6IS 98 BMW E36 M3 modified
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#4
12-23-2015, 06:28 PM
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Do you think if my ECU had the same problem it could cause my no start issue?
http://www.xoutpost.com/bmw-sav-foru...ont-start.html
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#5
12-23-2015, 06:35 PM
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Now this is a useful post! Thanks for sharing.
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Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E 
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#6
12-24-2015, 09:19 AM
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Thanks for sharing.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#7
12-24-2015, 01:05 PM
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Great troubleshooting. Thanks for passing it on.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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#8
02-10-2016, 11:48 PM
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It's been months now since my buddy and I fixed the issue and everything is still running amazingly guys.
If EVER you get a weird 'no communication issue with your ECU or Transmission, head straight to the ECU boxes and investigate. Also, rebuilt alternators are garbage. my buddy pulled mine apart and he quickly realized how cheaply 'repaired' they are. He ordered new military spec parts and installed them and my alternator has been awesome every since. I had nothing to do with the battery at all. On the E53 X5 we didn't have a choice of selecting different batteries in the software he was using so we went straight to the mechanical side of things and fixed them. Now we're looking into fabricating a set of headers for my engine based off of special header calculating software that takes literally everything into consideration so it's going to be interesting. Wish me luck.
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If you can still see the disapointment on his face in your rear view mirror, he's not far enough behind. 98 M3 Sedan blk/blk Sold 00 BMW 540i Sold 03 BMW 4.6IS 98 BMW E36 M3 modified
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