Notices
 
 

  

User Tag List

Thread: C6 estate auto box woes

Results 1 to 9 of 9
  1. C6 estate auto box woes 
    #1
    Join Date
    Feb 2014
    Location
    Oxford
    Posts
    80
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    7 Post(s)
    So my old 200k+ miles '05 reg 3ltr diesel estate lumbers on but has now thrown what looks like a gearbox problem and now won't select gears. The centre display went bold and diagnostics indicated fault numbers P0729, P0735 and P0783. Initial research suggests either the ECU or the transmission itself - obviously I'm hoping it's the ECU but I can't find conclusive info as to where it is? Some suggest it's under the carpet on the passenger side but is that l/h or r/h drive passenger? I'm going to try to have a look this weekend (if weather allows). I did have a problem a few years ago with the heater matrix leaking coolant into the cab so I'm wondering if the ECU is under the floor whether that might have had some adverse effects, but why has it waited all this time to show itself? Oh, one more clue, my diagnostic box could not communicate with the EMU and that's new so would gearbox ECU failure break the comms chain and cause that too?
    Btw P0729 is "Gear 6 Incorrect ratio", P0735 is "Gear 5 Incorrect Ratio" and P0783 is "3-4 Shift".
     
    0 0 0
     

  2. Re: C6 estate auto box woes 
    #2
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    42,103
    Post Thanks / Like
    Blog Entries
    4
    Mentioned
    108 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    1816 Post(s)
    It is in the sump of the box itself. ZF 6HP-19
     
    0 0 0
     

  3. Re: C6 estate auto box woes 
    #3
    Join Date
    Feb 2014
    Location
    Oxford
    Posts
    80
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    7 Post(s)
    Hmm, that does't sound like it makes things easier ..... Interesting write-up about that gearbox here: ZF 6HP transmission - Wikipedia maybe I'm lucky it's lasted 200k! So is there any hope or does this mean the old girl is heading for the breakers? I spoke to a local Audi chap who said he'd be disenclined to change the transmission fluid in such an old box, it nmight cause more problems than it solved, but that was of course before this catastrophe!
     
    0 0 0
     

  4. Re: C6 estate auto box woes 
    #4
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    42,103
    Post Thanks / Like
    Blog Entries
    4
    Mentioned
    108 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    1816 Post(s)
    Personally I would say it is terminal as you were selling it anyway, you would be looking at £3000 ish for a rebuild at a typical specialist or if you had really lost touch with reality, £6945.86 plus installation for a genuine Audi exchange unit or you could really lose the plot and buy a new one outright for £8993.18... but those prices do include VAT!
     
    0 0 0
     

  5. Re: C6 estate auto box woes 
    #5
    Join Date
    Feb 2014
    Location
    Oxford
    Posts
    80
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    7 Post(s)
    Ok so assuming I don't have that money and haven't got a winning lottery ticket scrunched up in a pocket somewhere, would it be worth trying a fluid change? I can't see that there would be much to lose at this point.
     
    0 0 0
     

  6. Re: C6 estate auto box woes 
    #6
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    42,103
    Post Thanks / Like
    Blog Entries
    4
    Mentioned
    108 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    1816 Post(s)
    I think that would be a few more hundred pounds into the drain unit, at least it would make the job of stripping it down cleaner. This is going to be a problem that kills good useable cars in the future even more than now, £20k for a battery at 10 years old may concentrate the mind but few are listening and the consumers of the future are going to pay the price… oldies will blame Boris, the younger ones will say “who?”…
     
    0 0 0
     

  7. Re: C6 estate auto box woes 
    #7
    Join Date
    Feb 2014
    Location
    Oxford
    Posts
    80
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    7 Post(s)
    Oh don't get me started on the EV subject - even ignoring the whole battery issue (which is controversial enough by itself), what happens when everyone gets home at around 6pm, then everyone plugs their cars in to fast recharge (so they stand some chance of going out again that evening) and then many try putting the ovens on too to cook dinner? I see pylons melting if the grid hasn't already tripped out!

    Anyway, back to the subject. It's strange that this fault has suddenly appeared, the vehicle has only just had a successful MOT after having some work on the coolant/heating system (split pipes) which wasn't cheap and was running fine until literally 2-3 days ago, so I'm loath to give up on it just like that. I'm aware that throwing money at it would solve the problem but I don't have a lot so I'm going to make sure every avenue available to me is tried before calling ASM etc.
     
    1 2 0
     

  8. Re: C6 estate auto box woes 
    #8
    Join Date
    Feb 2014
    Location
    Oxford
    Posts
    80
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    7 Post(s)
    I've just done some more investigations and here's what I've found:
    1. The vehicle still won't select a gear, but since I cleared the fault codes a couple of days ago, they have NOT reoccurred.
    2. I disconnected the battery, left it so for a while and then tried again. Still no gears but still no fault codes either?
    3. The gear select lights next to the gearstick, and the dash display, all appear to be doing what they should, in both auto and semi-auto modes.
    4. I can read the transmission status fine but cannot communicate at all with the engine ECU. This is definitely also a new problem.
    I can't help but feel the gear selection fault and the engine ECU problem are related somehow? Could failure of one or other, or failure of wiring/connectors between them, have any bearing on the situation? Is it really true that the gearbox ECU is actually inside the sump of the gearbox?
     
    0 0 0
     

  9. Re: C6 estate auto box woes 
    #9
    Join Date
    Mar 2008
    Posts
    73
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    0 Post(s)
    For what its worth, my Touran TCU ( its a TCU for a gearbox, not an ECU ) is behind the near side headlight, under the wheel arch liner.
     
    0 0 0
     

Similar Threads

  1. A4 2001 Xreg tdi estate wiper woes
    By Ian1971 in forum Audi A4 - B5 Forum - 1995 - 2002
    Replies: 4
    Last Post: 23-02-2011, 12:03 PM
  2. auto transmission woes
    By saxon10sept in forum Golf MK3 - 1993 - 1999
    Replies: 1
    Last Post: 19-06-2010, 06:54 PM
  3. auto box woes
    By chunky69 in forum Passat - B5 Forum - 1997 -2005
    Replies: 2
    Last Post: 01-03-2010, 01:17 AM
  4. auto box woes
    By chunky69 in forum New Member Introductions
    Replies: 1
    Last Post: 28-02-2010, 11:27 PM
  5. 2.8 auto gearbox woes
    By ianharrris in forum Audi Cabrio - Coupe - Quattro's - UR Quattro
    Replies: 0
    Last Post: 05-08-2008, 07:14 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -