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7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 09-22-2019, 12:16 PM
bessette bessette is offline
Vineyarddog
Location: Chicago
 
Join Date: Jun 2013
Posts: 37
Mein Auto: 2008 750i, 2012 x5 50i
E65 transmission slipping into neutral

I have a 2008 750i that will engage from park to drive or reverse without issue. However, it will then slip back into neutral about 50-60% of the time. To keep it in drive or reverse I need to hold the shifter up or down depending on whether Iím going into drive or reverse. After holding it for a few seconds then it stays engaged just fine. Transmission seems to shift smoothly without issue. No codes or malfunction lights come on. A few times it has shifted from drive to neutral when at a stop sign. (Never after itís warmed up). My local mechanic is perplexed and returned the car to me. We each agreed to do some research. Any ideas on this would be much appreciated.
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  #2  
Old 09-28-2019, 11:26 AM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 361
Mein Auto: BMW 850Ci
Might want to consider replacing the bridge seal at the valvebody. These tend to crack over the years. If the crack is very small you would still be able to "hold it" in gear, but as soon as it gets bigger, you don't have enough pressure and the car will shift itself back into park and give you the warning. Common problem on the ZF 6-speed transmission, but it is an easy fix.
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  #3  
Old 09-28-2019, 12:05 PM
tomcat74 tomcat74 is offline
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Location: Vancouver Washington
 
Join Date: Jan 2015
Posts: 129
Mein Auto: 2004 BMW 760LI, 1991 ZR1
Hello,


When I bought my 760li, I service my transmission and change the all fluids.
Sometimes the service was never done although the paper says so. I hope you find the problem, its usually a simple fix. The above comments I agree.

Manfred E.....
2004 BMW 760LI
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  #4  
Old 10-21-2019, 12:42 PM
bessette bessette is offline
Vineyarddog
Location: Chicago
 
Join Date: Jun 2013
Posts: 37
Mein Auto: 2008 750i, 2012 x5 50i
Tks for the info. I passed the information onto my mechanic who maintains the car.
A good shop but not necessarily a BMW specialist. Tks again
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  #5  
Old 10-21-2019, 07:03 PM
bessette bessette is offline
Vineyarddog
Location: Chicago
 
Join Date: Jun 2013
Posts: 37
Mein Auto: 2008 750i, 2012 x5 50i
To clarify, slips back to neutral, not park. Assume the conclusion is not affected.
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  #6  
Old 10-21-2019, 07:17 PM
TxGr8White TxGr8White is offline
Sick Puppy Motorwerks
Location: Dallas
 
Join Date: Jan 2010
Posts: 361
Mein Auto: BMW 850Ci
You need part #2 in the first pic (valvebody) and part #''s 5, 6, & 7 in the second pic. This no longer seal over time and cause the issue you are describing. When you go to fill the transmission, there is a precise procedure that must be followed. You may want to get a set of solenoids while you are in there, that will bring it back to how it was on day one. There is a company in Florida that seals a complete solenoid kit for these cars, you will need to talk to them and let them know what color solenoids and how many of each you have in the valvebody, as there are many different version of this transmission out there.
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Old 10-22-2019, 10:04 AM
bessette bessette is offline
Vineyarddog
Location: Chicago
 
Join Date: Jun 2013
Posts: 37
Mein Auto: 2008 750i, 2012 x5 50i
Great Information. Thanks for being so specific along with diagrams. I have sent to
the shop and I will keep you posted.
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  #8  
Old 10-26-2019, 03:38 PM
GeorgeBush234 GeorgeBush234 is offline
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Location: Mexico
 
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Mein Auto: Passat
Its sounds like a manual gearbox problem. But then again The torque converter should be checked first.
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