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  #1  
Old 06-12-2018, 11:46 AM
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E53 Out of the Blue Intermittant No Transmission Issue

Hi guys,
I would appreciate any help please:
'01 X5 E53 3.0L Automatic: Driving the other night with only lights on (no heater or A/C) - Then trans goes into dead mode without a Check Engine light or Trans. Prog. - As if it was put into Neutral. Pull over, turn off the engine, restart, put in gear: same thing. No gears, not forward, not backwards. When I put the gear shifter back into P after going into different gears, I get a grinding sound out of the tranny that lasts a total of about 3 seconds, and is decelerating, which slows down to an eventual stop. It did that every time I put it into gear and went back to P. Get towed home. Next morning start the X5 up, works just fine. As if nothing ever happened. I'm clueless...
Battery is Brand New BMW big battery.
Alternator was tested this morning - is fine.
Transmission has never been anything short of perfect.

What could cause this?
Thanks in advance.
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  #2  
Old 06-12-2018, 12:14 PM
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I would check for trouble codes first though it sounds like transmission or associated issue. I would have an independent transmission shop do a thorough diagnosis. To be sure I didn't make the problem worse I would have it taken to the shop on a flatbed.
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Old 06-12-2018, 12:49 PM
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It could be transfer case or worn out gear in drive shaft.
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Old 06-12-2018, 01:07 PM
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I agree that it sounds like a transfer box/worn propshaft spline issue.

The noise you hear when you put it in Park is the park pawl ratcheting on the park lock gear because the output shaft is rotating. You should be able to tell because the park lock won’t hold the vehicle.

Phil
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Old 06-12-2018, 01:14 PM
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The stupid part is that now it works fine. I did run a scan the next morning and this is what I got:
44 DME - Activation, Solenoid valve, tank vent
20 DSC - Wheel Speed Sensor Front right, transmits implausible signal
A - IHKA: AUC Sensor
BD - KOMP: KOM Instr. Cluster: Fault Stored
28 - LCM: Light Check Module: Fault Stored
3 - LRA: Sensor Fault Rear
Nothing to do with transmission/transfer case...
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Old 06-12-2018, 02:27 PM
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Take the harness connector at the transmission apart and check for corroded pins or contamination in the sockets. Clean thoroughly with electrical contact cleaner, coat with dielectric grease and reassemble. Reset codes and test vehicle.


2002 X5 3.0 344,000 miles
2014 428i 39,000 miles


2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles


1970 Firebird Under restoration
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Old 06-13-2018, 06:11 PM
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[QUOTE=srmmmm;1135847]Take the harness connector at the transmission apart and check for corroded pins or contamination in the sockets. Clean thoroughly with electrical contact cleaner, coat with dielectric grease and reassemble. Reset codes and test vehicle.

Thanks, I will give that a try. In my way of thinking if it is a mechanical issue, how can it just render a perfectly working transmission useless and then the next day go back to being just fine??? I can't think of a single time where I've seen such a thing.



But I can say that I have seen weird things happen on a BMW transmission when the alternator/battery weren't up to par...


And also, I am really hoping that I won't have to get into major transmission issues.
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