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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

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  #1  
Old 03-12-2014, 07:26 AM
mrfig40 mrfig40 is offline
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P0705 code. Transmission not in sync.

Has anyone come across this issue. Any ideas how to fix


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  #2  
Old 03-12-2014, 07:35 AM
CitizenOfDreams CitizenOfDreams is offline
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Code P0705 means a problem with the transmission range sensor. It's the electrical switch on the gearbox which tells the DME (or the TCM? or both?) which position is selected on the shift lever. I would start with getting under the car and check the switch and its wiring for physical damage.
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  #3  
Old 03-12-2014, 08:18 AM
mrfig40 mrfig40 is offline
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Osm. Thanks. I will look into that.


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  #4  
Old 03-12-2014, 11:07 AM
mrfig40 mrfig40 is offline
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Do you know if that's also the same as the neutral safety switch


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  #5  
Old 03-12-2014, 11:20 AM
CitizenOfDreams CitizenOfDreams is offline
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Quote:
Originally Posted by mrfig40 View Post
Do you know if that's also the same as the neutral safety switch
A "neutral safety switch" performs a similar function in a manual transmission. It is not the same.
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  #6  
Old 03-12-2014, 06:30 PM
mrfig40 mrfig40 is offline
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Nice work on the audio by the way.


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  #7  
Old 03-12-2014, 07:43 PM
CitizenOfDreams CitizenOfDreams is offline
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Originally Posted by mrfig40 View Post
Nice work on the audio by the way.
Thanks!

I'm trying to measure its performance (frequency response) as we speak. Will post results...
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  #8  
Old 03-13-2014, 10:32 AM
mrfig40 mrfig40 is offline
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Sir might you have a picture of what that transmission switch or sensor looks like. Trying to find it to get oem numbers off of it to try and locate correct part


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  #9  
Old 03-13-2014, 11:02 AM
CitizenOfDreams CitizenOfDreams is offline
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It's part #5 on the diagram, "position switch", BMW p/n 24107512755.



P. S. Seems like some online stores do indeed call that part a "neutral safety switch" - which it's not. Wouldn't be the first time people misname parts though.
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  #10  
Old 03-13-2014, 11:25 AM
mrfig40 mrfig40 is offline
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Thankyou


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  #11  
Old 03-13-2014, 11:43 AM
mrfig40 mrfig40 is offline
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Do you know what years that covers


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  #12  
Old 03-13-2014, 12:02 PM
CitizenOfDreams CitizenOfDreams is offline
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All 740i with 5HP24 transmission, which is 1996 to 2001.
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  #13  
Old 03-16-2014, 04:46 AM
mrfig40 mrfig40 is offline
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Sir. I have checked harness. Looked fine so went ahead and got a new switch from dealer. My guy cleared code. And shows no code now but his upgraded snap on he got just to read this car and snap on still shows starter disengaged due to p/n. Park neutral what I'm guessing. So he opened up trans module next to dme and noticed alittle spot in PC board that could be the issue. But still not 100% sure. Any ideas.


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  #14  
Old 03-16-2014, 08:24 AM
CitizenOfDreams CitizenOfDreams is offline
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Does the indicator in the instrument cluster show the correct gear as you move the shift lever?
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  #15  
Old 03-16-2014, 08:29 AM
mrfig40 mrfig40 is offline
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Yes it does.


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  #16  
Old 03-16-2014, 08:45 AM
CitizenOfDreams CitizenOfDreams is offline
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In that case leave the TCM alone before you kill it. It's probably fine.

Was the car starting before the switch replacement?
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  #17  
Old 03-16-2014, 09:43 AM
mrfig40 mrfig40 is offline
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No.when I got it it had been sitting for awhile with dead battery. Put good battery. Then put new starter. After buying new key from bmw. Then after realizing dws was moisture ruined I thought cause it had been sitting in water. I got new dme. Sent key dme and Ews to rpm to blank and link all three. While waiting on that. Put in a new relay harness off of car that I picked up running motor from. While waiting for parts I had all gaskets and seals replaced while motor was out to assure no leaks. Tried a new ignition switch and that didn't help. The car is nice but getting frustrated and trying to avoid giving up and parting car


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  #18  
Old 03-16-2014, 10:54 AM
CitizenOfDreams CitizenOfDreams is offline
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Wow. You have a big mess on your hands. Too many variables - new DME, new harness, water damage... And the biggest variable is the non-BMW mechanic who is using non-BMW diagnostic tools (and who is bold enough to open the TCM, very likely without having any idea about what is going on).

I was under impression you had a running car that all of a sudden threw an error code. That could be fixed with a little help from the forum. What you have is a more serious situation that requires someone who knows E38 inside out and has the physical access to the car. Having said that, I'm not trying to discourage you. Don't give up, and best of luck to you.
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