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#11
07-23-2012, 11:43 PM
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My conclusion is that once I noticed the coolant leak (reservoir split) and decided to just keep putting in more coolant hoping the problem would go away was a very bad decision. Coolant draining down onto the Voltage Reg. caused the failure. So if your reservoir is leaking go ahead and change it fast and avoid this problem.
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2005 X5 4.4 Alpine White/Tan 2006 A6 3.2 Gray/Ebony 2002 A6 3.0 Silver/Platinum 
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#12
08-25-2012, 11:58 PM
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I may have the same problem
 SlickGT1, I sent this in a private message but thought I should post to the thread instead. I saw your post on flipping the transfer case actuator gear and wondered if the issue I'm having might be solved by doing the same. I have a 2002 X5 E53. I engaged the cruise control while driving on a level road. As I started to climb a slight, gradual grade the X5 started to accelerate to climb the small hill. Almost instantly the X5 seemed to stall and surge violently. The car would not accelerate and multiple lights came on as the instrument panel displayed a DSC failure, Trans failsafe prog, and engine failsafe prog. Is this the same sort of thing that happened to you. Any help you could provide would be greatly appreciated. Thanks in advance.
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#13
08-26-2012, 12:01 AM
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Sounds like a voltage issue with you. Search here how to unlock OBC, then run the voltage test. Monitor your voltage while driving. I have a feeling your voltage regulator is shot, and you get overvoltage.
How old is your battery?
__________________
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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#14
08-26-2012, 12:09 AM
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Follow up information
Thanks for the very quick reply SlickGT1.
However, I can't drive the car. When I start it, it idles extremely rough...as though it is about to die. I can't rev the engine at all. The accelerator has no effect. I have put a volt meter on it and I'm getting around 13.7 volts when the car is running but it is fluctuating, I am guessing because of the very rough idle. With the engine off, the battery is at 12 volts. I'm checking this by connecting a volt meter to the pos and neg battery connections under the hood...is this correct?
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#15
08-26-2012, 12:14 AM
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That is fine then, that is where you should be. Hmm disconnect the maf and try again, see how it idles. Did you try scanning for codes?
__________________
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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#19
08-26-2012, 12:05 PM
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That voltage is not that bad. How old is your battery, and is it OE BMW?
You really need to get the codes scanned. Oh put your car info in your signature. Helps others advise without reading for an hour. Thanks.
__________________
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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