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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 04-22-2015, 04:33 PM
7serieserror 7serieserror is offline
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Location: Springfield, Oregon
 
Join Date: Apr 2015
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Mein Auto: 04 745i
Smile Plz help me find correct part

Good evening bimmerpeepz,

I've been having issues with my transmission lately where it wont grab any of the gears anymore, but when put in reverse the car would go forward very slowly and that's after playing with gear selector on D, N and Reverse for like a minute or so. It also threw up the RED transmisson failsafe, so I'm not able to do anything. Had the battery and alternator replaced about year ago, so I dont think it's that. Had a mechanic run his scanner tool to find out what the heck is going on and its telling him its the transmission control module!?!?! I cant find anything online for that part! It's driving me a little bit insane and would greatly appreciate any info/help on what the part number or even correct name of that part is, if it even exists that is. Thank you a billion times in advance for the help.

P.S. I should have the code later from what the scanner is throwing up and ill post it on here to see if anyone else has had the same code in the past!
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  #2  
Old 04-22-2015, 04:39 PM
Gambrell4 Gambrell4 is offline
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Location: S. Florida
 
Join Date: Oct 2012
Posts: 31
Mein Auto: 02 745i
Your mechtronic unit is bad. Mine was doing the same exact thing. What codes are coming up?
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  #3  
Old 04-22-2015, 10:42 PM
hugo_za hugo_za is online now
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Location: Johannesburg, South Africa
 
Join Date: Mar 2013
Posts: 189
Mein Auto: E65 740i LCI
Correct...the EGS is integrated into the Mechatronics. Without knowing your VIN for the exact part number we can only give you a rough idea. Check out this link for an indication of the cost... TBH a 2004 7-series being a pre-facelift is getting on in years and the cost of the mechatronics is really high in relation to the value of the car.

Just my 2c worth.
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  #4  
Old 04-23-2015, 02:27 AM
Gambrell4 Gambrell4 is offline
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Location: S. Florida
 
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Mein Auto: 02 745i
I paid $1500 for the mechtronic unit for my car
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  #5  
Old 04-23-2015, 05:30 AM
TechFreak TechFreak is offline
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Location: Scotland
 
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Mein Auto: AC Schnitzer 745i Sport
Yep ...it's something in the mechatronic module that's got a problem.

The cost here in the UK for a new one (approx $4500 USD for new and fitted) is more than the price of the car's worth.

So my car is currently in a garage with an Automatic Transmission specialist who's gonna remove and open the module and see if he can find anything wrong.

My car currently has the same symptoms.....when it was hot after a long run and put into park after stopping ...it would then not go into drive or reverse.

Strangley it would creep forward very slowly in reverse and drive.

I found a quick fix for mine to get the gears 'temporarily' working again was to put the car into Neutral - (not park - which is a gentle flick up or down on gear stalk)
......then rev the engine (2000rpm+) and would hear and feel a mild clunk.

The car would then go into drive and reverse again.


The fault i have on the OBD was :
P0736 - Reverse Incorrect Gear Ratio

The faults i have on the EGS were :
507B/507C (Parking gear sensor implausible signal) and 507D (Parking gear incorrectly disengaged)

Going by this BMW's service bulletin i have a Mechatronic Adapter Seal cracked or broken (but will update as soon as i hear from my mechanic) :
http://www.bimmerfest.com/forums/att...8&d=1363737705


I found this write up useful to understand how the mechatronic module works and the failures :

http://www.bmwlogicseven.com/?p=3738


Here's the DIY (courtesy of wilson009) to show you how to replace/fix it :

http://www.bimmerfest.com/forums/att...7&d=1291335701

Wilson009's thread where i got the above doc from :

http://www.bimmerfest.com/forums/sho...d.php?t=502966


.

Last edited by TechFreak; 05-13-2015 at 01:25 PM.
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  #6  
Old 04-23-2015, 01:23 PM
7serieserror 7serieserror is offline
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Location: Springfield, Oregon
 
Join Date: Apr 2015
Posts: 2
Mein Auto: 04 745i
You guys are awesome! Thank you for all of your input. I did quite a bit of research last night and found that these units are not cheap by any means. Another solution to that, that I found is to replace all the solenoids on the mechatronic unit. The set is around $500 from eriksonindustries.com. They are authorized ZF transmission parts dealer. I'm crossing my fingers this works otherwise I am literally S.O.L Cause there's no way I can afford the mechatronic unit right now with my current situation. If the swapping out the old solenoids doesn't work my plan B is to find another mech unit from a same year and model in a salvage yard. Let the fun begin! lol
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  #7  
Old 04-23-2015, 01:55 PM
Gambrell4 Gambrell4 is offline
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Location: S. Florida
 
Join Date: Oct 2012
Posts: 31
Mein Auto: 02 745i
If its the EGS causing the problem changing the solenoids will not fix the issue. That was my problem. But you can try it.
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  #8  
Old 04-23-2015, 02:10 PM
Gambrell4 Gambrell4 is offline
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Location: S. Florida
 
Join Date: Oct 2012
Posts: 31
Mein Auto: 02 745i
This is where i got my mechtronic unit from www.thectsc.com
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  #9  
Old 05-02-2015, 01:19 AM
TechFreak TechFreak is offline
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Location: Scotland
 
Join Date: Aug 2009
Posts: 988
Mein Auto: AC Schnitzer 745i Sport
Got car back running sweet again.

It WAS the Mechatronic Adapter Seal (Part 2 in pic below) as per the BMW service bulletin in my post above.

The seal was broken into 3 parts.

The mechanic changed parts 1 & 2 in the pic below, serviced the mechatronic module by taking it apart and removing the fine debris inside, flushed it out with cheap oil and replaced with new Meyle ATF plus 6 Oil and it's solved ALL the transmission issues :



For info i also had the sump replaced as it had to come off anyway to prohibit any future leaks.


.

Last edited by TechFreak; 05-13-2015 at 10:18 AM.
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  #10  
Old 05-02-2015, 11:20 AM
hugo_za hugo_za is online now
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Location: Johannesburg, South Africa
 
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Posts: 189
Mein Auto: E65 740i LCI
Happy to read that you are sorted bud :-)
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