P17d4 ошибка dl501

Имея богатый опыт по ремонту роботов, мы собрали коды ошибок с указанием направления поиска неиспрановстей. Стоит отметить, что наличие определенной ошибки не всегда означает 100% понимание способа ее устранения. Как пример, механические неиспрановсти по клапану регулирования сцепления не означает повреждение самого клапана, в данной цепочке причинно-следственных связей также находятся каналы в блоке, клапана в корзине сцепления и фрикционы самого сцепления. В тоже время есть ряд ошибок, которые явно указывают на проблемное место, к примеру, ошибки по температурным платам. Мы рекомендуем всегда комплексно подходить к поиску и устранению проблем и всегда готовы Вам помочь с данным вопросом.

1. 09-04-2019 11:08 AM

   
   

   #1

   

   
   Junior Member
   

   Two Rings

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   DSG Throwing Code 8955 P17D4 — Valve 3 in Transmission Part 1
   

   Having some DSG issues. I have reviewed tons of previous posts to no avail so thought I would post this to see if anyone has ideas.

   History:
   Purchased 2012 S4 in August 2018. The car had 42k miles on it and at times would exhibit the hard shift from 2-1 when rolling to a stop.

   This continued somewhat consistently until April-ish 2019 when symptoms expanded to include:
   � Relatively consistent hard down-shift from 2-1 when rolling to a stop
   � Weird hard-shift (or clutch disengagement ) when going from full stop to engaging 1st gear
   � Went into limp mode twice � only 2nd, 4th and 6th gear available. Would always reset to normal if car was restarted.
   � While cruising at highway speeds it felt like transmission would slip momentarily (similar feel to clutch disengaging from stop to 1st) under light acceleration.

   In May I decided to go ahead and change transmission fluid/filters and also installed the Mechatronics repair kit (part 0B5398009F). This immediately stopped the limp mode and the slip while cruising. The 2-1 hard down-shift and stop-1st hard-shift were still there, although not as consistently.

   That brings me up the the last two weeks where the car has gone into limp-mode twice. The intermittent VCDS code is: 8955 � Valve 3 in Transmission Part 1; P17D4 00 [096] Mechanical Malfunction.

   Anyone have ideas or guidance on where to go from here to address the issue? I found this service over in the UK (https://www.ecutesting.com/common-fa…ronic-problem/) that looked interesting but haven�t found anything comparable in the US.
   Thanks!

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2. 09-04-2019 11:51 AM

   
   

   #2

   

   
   Veteran Member
   

   Three Rings

   

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   Those guys and Maktrans are the go to guys unless you go OEM.

   https://maktrans.net/rem-ob5-500?search=dl501

   03 C5 RS6 — Quickest/Fastest C5 RS6 in the USA — Sold
   13 C7 A6 Prestige — Nexttt

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3. 09-04-2019 01:36 PM

   
   

   #3

   

   
   Junior Member
   

   Two Rings

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   Thanks. Anyone have experience with Maktrans or Ecutesting? I’m a little cautious of pulling out my mechtatronic and shipping it overseas.

   Has anyone been successful in sourcing and/or repairing the solenoids yourself?

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4. 09-04-2019 03:57 PM

   
   

   #4

   

   
   Veteran Member
   

   Three Rings

   

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   You can buy a reman unit from Maktrans and swap your TCU over. Might have to send your core back. You can talk to him on WhatsApp

   03 C5 RS6 — Quickest/Fastest C5 RS6 in the USA — Sold
   13 C7 A6 Prestige — Nexttt

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5. 09-09-2019 05:10 PM

   
   

   #5

   

   
   Active Member
   

   One Ring

   

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   Originally Posted by CM02
   

   Thanks. Anyone have experience with Maktrans or Ecutesting? I’m a little cautious of pulling out my mechtatronic and shipping it overseas.

   Has anyone been successful in sourcing and/or repairing the solenoids yourself?

   I’m in the exact same boat as you with the exact same symptoms. I have a 2012 with 85k miles. My car just got the P17D400 fault. Have you looked into the Maktrans unit?

   2012 Audi S4 — Ibis White: ROC-EURO Cold Air Intake, Milltek Cat-back Exhaust, Sport Springs, 034Motorsport Stage 1 ECU/TCU tune, VMR V701 19×9.5

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6. 09-12-2019 11:17 AM

   
   

   #6

   

   
   Active Member
   

   One Ring

   

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   I reached out to Maktrans about a valve body repair/replacement. I gave them the error code we are all getting (P17D400), and asked if they have any experience with this code. His reponse was «You have to change or repair wet clutch». This to me makes more sense than the solenoids, since the error says «mechaninal malfunction». Just FYI, maybe it can help.

   2012 Audi S4 — Ibis White: ROC-EURO Cold Air Intake, Milltek Cat-back Exhaust, Sport Springs, 034Motorsport Stage 1 ECU/TCU tune, VMR V701 19×9.5

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7. 10-10-2019 07:13 AM

   
   

   #7

   

   
   Registered Member
   

   One Ring

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   Hello

   It is possible to buy 2 types or repair / service to DL501 / 0B5 gearboxes

   This kit is incl solenoids

   Solenoid N440
   Solenoid N436
   Small valve N471 / N472
   2 mechatronic cards 0B5398009D / 0B5398009E
   screw
   1 set of security parts for printed films
   2x small filter

   https://www.oemvwshop.com/0b5398048d…6-q5-p2231018/

   This repair kit is excl solenoids and is cheaper:

   https://www.oemvwshop.com/0b5398009f…-set-p2148161/

   But I think this will not help if someone got faultcode to any solenoid.

   Oil service with filters and basic settings is needed with replacing.

   Hope these informations will help to someone.

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8. 11-21-2019 07:45 AM

   
   

   #8

   

   
   Junior Member
   

   Two Rings

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   My symtoms are dramatically increasing in frequency. Ordered the following solenoid and wiring kit from Maktrans: https://maktrans.net/zaptchasti-akpp…01-mechatronic

   Will report on effectiveness after the install.

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9. 11-30-2019 05:07 AM

   
   

   #9

   

   
   Active Member
   

   Two Rings

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   DSG Throwing Code 8955 P17D4 — Valve 3 in Transmission Part 1
   

   I�m curious how this works out for you. I just installed that exact kit about a week ago and it solved my issues of stalling and surging, I did not have any codes. Pulled the solenoids apart after expecting to find bushing wear but couldn�t find anything major as they describe in some of their articles but I do believe these were the main issue. Also didn�t require immediate adaption after startup but was performed later. I still am unsure the longevity of my clutches but they feel ok for now, i haven�t heard of anyone trying them but if they fail in the future I plan to try the raybestos clutch/steel set. Good luck!

   Last edited by Ktsieja; 11-30-2019 at 05:24 AM.

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10. 12-05-2019 05:08 AM

    
    

    #10

    

    
    Senior Member
    

    Two Rings

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    I really hope this works for you! Please keep us informed!

    Originally Posted by CM02
    

    Sent from my MHA-L29 using Audizine mobile app

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12. 12-05-2019 05:10 AM

    
    

    #11

    

    
    Senior Member
    

    Two Rings

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    Still working out for you?

    Originally Posted by Ktsieja
    

    I�m curious how this works out for you. I just installed that exact kit about a week ago and it solved my issues of stalling and surging, I did not have any codes. Pulled the solenoids apart after expecting to find bushing wear but couldn�t find anything major as they describe in some of their articles but I do believe these were the main issue. Also didn�t require immediate adaption after startup but was performed later. I still am unsure the longevity of my clutches but they feel ok for now, i haven�t heard of anyone trying them but if they fail in the future I plan to try the raybestos clutch/steel set. Good luck!

    Sent from my MHA-L29 using Audizine mobile app

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13. 12-07-2019 04:23 PM

    
    

    #12

    

    
    Active Member
    

    Two Rings

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    DSG Throwing Code 8955 P17D4 — Valve 3 in Transmission Part 1
    

    Originally Posted by clettngx
    

    Yeah all is well after almost 1000 miles. I did get a DSG tune and went stage 2 right after fixing it, holding up great.

    Sent from my iPhone using Audizine

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14. 12-07-2019 04:44 PM

    
    

    #13

    

    
    Active Member
    

    Two Rings

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    Also I want to add for anyone in a rush to fix their car using Maktrans my package took nearly a month to arrive. Customs in NY held it for 2.5 weeks not sure if this is common for products such as this coming overseas. Just keep it in mind

    Sent from my iPhone using Audizine

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15. 12-09-2019 08:12 AM

    
    

    #14

    

    
    Junior Member
    

    Two Rings

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    I received the parts from Maktrans (mine took about two weeks to get to TX) and installed term over the weekend. Unfortunately I am still getting the same p17d4 code after the driving for a while and in stop/go traffic.

    Any ideas are appreciated.

    I have never been able to get the clutch adaptation to succeed with vagcomm. It starts and goes (revs up to ~1200) for a minute or two and then aborts for �safety reasons.�

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16. 12-09-2019 10:49 AM

    
    

    #15

    

    
    Veteran Member
    

    Four Rings

    

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    I think you should ask Maktrans and tell them you had these symptoms you tried to cure by installing some parts from them but the parts didn�t fix it. They might suggest other possible reasons for this malfunction.
    I am no expert in these transmissions, but I can throw in a suggestion to check if your mech unit was installed correctly, and whether all the gear change hooks got engaged with gear change levers. Most likely, they are, since you said this code appears after driving for a while.
    Anyway, best bet is to ask the Maktrans and see if they can suggest anything.
    P.S. there are solenoids responsible for actuating gear shift mechanism, failure of one of these solenoids is also a possibility

    Last edited by fastboatster; 12-09-2019 at 12:06 PM.

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17. 12-09-2019 12:16 PM

    
    

    #16

    

    
    Junior Member
    

    Two Rings

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    Originally Posted by fastboatster
    

    I think you should ask Maktrans and tell them you had these symptoms you tried to cure by installing some parts from them but the parts didn�t fix it. They might suggest other possible reasons for this malfunction.
    I am no expert in these transmissions, but I can throw in a suggestion to check if your mech unit was installed correctly, and whether all the gear change hooks got engaged with gear change levers. Most likely, they are, since you said this code appears after driving for a while.
    Anyway, best bet is to ask the Maktrans and see if they can suggest anything.
    P.S. there are solenoids responsible for actuating gear shift mechanism, failure of one of these solenoids is also a possibility

    Thanks. Maktrans initially recommended this kit and a changout of the wet clutch. I did the kit but not the clutch at this point.

    Intuitively doesn�t feel like a clutch issue since the issue only occurs at higher operating temps.

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18. 12-10-2019 03:49 PM

    
    

    #17

    

    
    Active Member
    

    Two Rings

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    DSG Throwing Code 8955 P17D4 — Valve 3 in Transmission Part 1
    

    The solenoid (multiplexer) for this sub-transmission valve 3 is N435 for the K1 clutch. I tried to source 2 of them before I had my unit out and could not seem to get my hands on good quality solenoids also never heard of them failing, contacted linesoon.com but they never contacted me back. There are plenty of Chinese made solenoid kits floating around that include this though. If it were me I�d try to source that solenoid even if it were used or swap N435 for N439 to see if the issue moves before pulling the trans for clutches. Did you use the 3rd valve that comes in the Maktrans kit for the cooling circuit or main pressure?

    Sent from my iPhone using Audizine

    Last edited by Ktsieja; 12-10-2019 at 04:37 PM.

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19. 12-10-2019 07:21 PM

    
    

    #18

    

    
    Junior Member
    

    Two Rings

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    I’ll take a look at sourcing one of the N435 solenoids. If anyone knows of a good source please let me know.

    I used the third valve from maktrans in the cooling circuit (N471). Should I have used for the main pressure valve?

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20. 12-11-2019 03:18 AM

    
    

    #19

    

    
    Active Member
    

    Two Rings

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    DSG Throwing Code 8955 P17D4 — Valve 3 in Transmission Part 1
    

    Originally Posted by CM02
    

    I’ll take a look at sourcing one of the N435 solenoids. If anyone knows of a good source please let me know.

    I used the third valve from maktrans in the cooling circuit (N471). Should I have used for the main pressure valve?

    I don�t know for sure that it would fix anything but I would note they have issues with those solenoids based on what Maktrans states in their write up. I put mine to the main pressure circuit as I was having driveability issues at all temperatures, couldn�t hurt to swap the two while in there as it didn�t seem to fix anything in its current location.

    Last edited by Ktsieja; 12-11-2019 at 03:29 AM.

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21. 12-15-2019 02:55 PM

    
    

    #20

    

    
    Junior Member
    

    Two Rings

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    My symptoms appears to be resolved — no hard starts going into first gear or gearbox messages/fault codes for a few days.

    This time around I did the following:

    1) Swapped N435 with N439. Did this hoping to move the issue over to K2 since the messages I was getting were related to K1 and limited me to 2/4/6/R when the car went into limp mode. It appears this did not have an effect.

    2) Reinstalled my old N471 (Cooling oil valve) and moved the new solenoid from Maktrans over to the N472 (main pressure valve) position. N472 could have been the issue all along.

    3) When reading a post over on the S5 board about a similar issue someone mentioned that their gearbox/center diff fluid was low and after properly filling, their problem was resolved. I had not even thought to check this since I did not have any signs of leaks. Went ahead and checked it while the car was up on jacks. I expected to find a low oil condition but fluid started pouring out when I opened the fill plug. Based on the size of the puddle on the ground combined with what I was able to catch in my oil pan I estimate that the gear box/center diff was overfilled by maybe 0.75 liters. Not sure if this contributed to the P17D4 issue but definitely was overfilled (yes, I�m certain the car was level).

    Whatever it was I�m glad it is working now. Hopefully it stays fixed.

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23. 12-15-2019 04:31 PM

    
    

    #21

    

    
    Veteran Member
    

    Four Rings

    

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    Very glad to hear it worked out for you!

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24. 12-21-2019 02:59 AM

    
    

    #22

    

    
    Active Member
    

    Two Rings

    

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    Hi, I have just come across this thread as my OB5 gearbox has been playing up lately and now just yesterday given the fault:
    1 Fault Found:

    8955 — Valve 3 in Transmission Part 1
    P17D4 00 [036] — Mechanical Malfunction
    Intermittent — Not Confirmed — Tested Since Memory Clear
    Freeze Frame:
    Fault Status: 00000001
    Fault Priority: 2
    Fault Frequency: 1
    Reset counter: 40
    Mileage: 136574 km
    Date: 2019.12.20
    Time: 15:37:24

    Engine speed: 637 /min
    Transmission input speed: 637 /min
    Transmission output speed: 0 /min
    Engine torque: 8 Nm
    Transmission fluid temperature: 48 �C
    Accelerator position: 0.0 %
    Clutch status: Beide Kupplungen offen

    I believe it is just the solonoid valve N435 with N439, I guess it is just sticky or worn out.
    I am considering ordering the Maktrans rebuild kit but these particular solonoids are not included.
    Whats your thoughts? should I try just changing the 2 solonoids or spend the other $700+ on the kit?

    I’d do the work myself on the mechatronic but might get a mechanic to put it on a hoist to get it out/in the box.

    Thanks

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25. 12-21-2019 05:32 AM

    
    

    #23

    

    
    Active Member
    

    Two Rings

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    It does not appear those solenoids are available by a good supplier at this time. I would say starting with the rebuild kit specifically the circuit boards which contacts include this circuit is a good start for you. Unfortunately if it is one of those solenoids you may need to source a used one from an old mech unit.

    Sent from my iPhone using Audizine

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26. 12-21-2019 07:16 AM

    
    

    #24

    

    
    Junior Member
    

    Two Rings

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    I had the same issue and I think mine was ultimately fixed by replacing N472. You can get N471 and N471 individually from maktrans. It could just as easily be a wiring/circuit board issue as Ktsieja stated so would do that as well.

    I found these posts helpful when I was dealing with the same issue:

    https://www.audizine.com/forum/showt…nsmission-Code

    https://www.audizine.com/forum/showt…tronic-(DL501)

    https://www.audiworld.com/forums/aud…2951673/page3/

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27. 12-21-2019 01:15 PM

    
    

    #25

    

    
    Active Member
    

    Two Rings

    

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    Thanks to both of you for the reply’s
    I will follow what you have suggested and replace whatever I can while its out of the car. I think it will be a new year job as I doubt any companies will be open now.
    I also tried to contact Linesoon and another Russian company that does that particular solonoid. So I will let everyone know if that comes through at all.

    Cheers

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28. 01-06-2020 12:11 AM

    
    

    #26

    

    
    Registered Member
    

    One Ring

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    Hello everyone,

    I was wondering how A4Torque got along with his issue. I own an A7 with the same DL501 7 speed S-Tronic (2011).
    I have similar symptoms described by CM02:
    1. Before Christmas:
    — Judder before coming to a stop (whilst transmission warm)
    — Judder in first gear whilst rolling from stop (whilst transmission warm)
    I’ve attempted the transmission adaptation via VCDS, failed during clutch adaptation with the ‘Safety reason’ message (similar attempt with same outcome on various occasions)
    Straight after the first adaptation attempt I got the:
    — P17D4 Valve 3 in Transmission Part 1 — Mechanical Malfunction — Intermittent — Confirmed —
    — P17D5 Valve 3 in Transmission Part 2 — Mechanical Malfunction — Intermittent — Not Confirmed —
    — P17D7 Clutch 2 — Pressure too High — Intermittent — Not Confirmed —
    — P2873 Clutch 2 Pressure Engagement too High — Not Confirmed —
    …obviously the adaptation made it worse. Kept loosing 2-4 sp + R when coming to a stop (transmission warm).

    2. few days ago took the car to Audi. Obviously they weren’t able to find the 38k transmission oil changes (though car was serviced at theirs every time), and got quoted for �11k to replace the gearbox since they took a sample of the transmission oil and found a dark colour/burnt smell/swarf flakes. I asked them to change the transmission oil anyway, and in effect I get:
    — P17D4 Valve 3 in Transmission Part 1 — Mechanical Malfunction — Intermittent — Not Confirmed —
    During the adaption drive Audi has taken with my car they had a loss of 1-3 sp. I can confirm the car drives smooth when transmission is cold (probably because of the oil change), however I hit the ‘Transmission Malfunction’ with loss of 1-3 sp after hitting stop-start traffic + rolling to/starting from a stop judder as before.

    Based on symptoms + fixes provisioned in this thread (posted by CM02) I’m tempted to have the N472 changed to start with. Could I get some thoughts on this please?
    I appreciate the help, and this is a very good thread indeed.

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29. 01-06-2020 02:25 PM

    
    

    #27

    

    
    Active Member
    

    Two Rings

    

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    Hi I’ve been away on holidays but I expect my new clutch pack to arrive tomorrow. I will then go to a friend’s place and use his hoist to replace the clutch. I’m actually doing this first before doing anything at all with the mechatronic unit. I spoke to Maktrans technical person before the holidays and this changed my view on what the fault is with my transmission. I will certainly report back on how it goes.

    Sent from my SM-G975F using Tapatalk

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30. 01-09-2020 03:40 AM

    
    

    #28

    

    
    Active Member
    

    Two Rings

    

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    Hi everyone, I have about 2 hours left in the morning and I will have changed the clutch unit.
    It was a tough job but if I was to do it again it would be easier.
    I’ll update on the results tomorrow night.

    Sent from my SM-G975F using Tapatalk

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31. 01-09-2020 11:12 AM

    
    

    #29

    

    
    Active Member
    

    Two Rings

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    Do you plan to pull them apart and inspect the plates? Just curious how they look. Also did you go with OEM clutches or aftermarket?

    Sent from my iPhone using Audizine

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32. 01-09-2020 12:16 PM

    
    

    #30

    

    
    Active Member
    

    Two Rings

    

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    Yes I pulled the old clutch unit apart and there was heat marks on the inner clutch pack. Blueing of the metal rings.So it must have been slipping.
    The outer ring looked totally fine.
    I went with the complete genuine Borg Warner unit.
    I just hope this is the root cause and not an effect of something in the mechatronic unit.
    I’m pretty confident it will be right.

    Sent from my SM-G975F using Tapatalk

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33. 01-11-2020 07:08 AM

    
    

    #31

    

    
    Active Member
    

    Two Rings

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    Originally Posted by A4Torque
    

    Yes I pulled the old clutch unit apart and there was heat marks on the inner clutch pack. Blueing of the metal rings.So it must have been slipping.
    The outer ring looked totally fine.
    I went with the complete genuine Borg Warner unit.
    I just hope this is the root cause and not an effect of something in the mechatronic unit.
    I’m pretty confident it will be right.

    Sent from my SM-G975F using Tapatalk

    Any luck with the new clutch packs installed? This code has popped up a few times lately for a few people

    Sent from my iPhone using Audizine

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34. 01-11-2020 11:35 AM

    
    

    #32

    

    
    Registered Member
    

    One Ring

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    A4Torque: don’t forget to run the clutch adaptation after you put everything together. Using a VCDS, this is the procedure:
    http://wiki.ross-tech.com/wiki/index…rbox_(DSG/0B5)

    This consists of Start Stop counter erase + clutch valve adaptation + distance sensor calibration.
    In my case (and I believe CM02’s was reporting this prior to changing the main valve solenoid as well) the clutch adaptation fails due to ‘Safety reasons’. If the adaptation gives you the ‘Safety reason’ failure, you might want to look at fixing the mechatronic (I would start with both clutch solenoids + main pressure valve).

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35. 01-11-2020 01:36 PM

    
    

    #33

    

    
    Active Member
    

    Two Rings

    

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    Originally Posted by bcc
    

    A4Torque: don’t forget to run the clutch adaptation after you put everything together. Using a VCDS, this is the procedure:
    http://wiki.ross-tech.com/wiki/index…rbox_(DSG/0B5)

    This consists of Start Stop counter erase + clutch valve adaptation + distance sensor calibration.
    In my case (and I believe CM02’s was reporting this prior to changing the main valve solenoid as well) the clutch adaptation fails due to ‘Safety reasons’. If the adaptation gives you the ‘Safety reason’ failure, you might want to look at fixing the mechatronic (I would start with both clutch solenoids + main pressure valve).

    Thanks bcc,

    Yes I did the adaptation but on my car the erase start stop processes has never worked.

    The clutch valve adaptation I couldnt get to complete successfully.

    The clutch engagement point did work. This was not the case before the new clutch went in.
    There are 2 solonoids that relate to each clutch, one is pressure regulation solonoid it is larger in size, the other is a smaller solonoid with an exposed wire coil. This is the solenoid that I am getting the fault code for. I was going to change this given thats what the error relates to.
    In hind sight I probably should have tried this first but I was advised it would be the clutch.

    Sent from my SM-G975F using Tapatalk

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36. 01-11-2020 01:44 PM

    
    

    #34

    

    
    Active Member
    

    Two Rings

    

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    Originally Posted by Ktsieja
    

    Any luck with the new clutch packs installed? This code has popped up a few times lately for a few people

    Sent from my iPhone using Audizine

    No unfortunately in my vehicle the new clutch did not fix anything….
    Just to clarify i replaced the entire clutch unit not just the friction plates. I was advised to do this incase the sealing rings for the hydraulics were worn. Apparently this can cause problems with the clutch unit also.
    I will turn my attention to the mech unit now and new valves.
    I guess at least the worst job is done and I shouldn’t have to pull the box out again.
    It did seem unusual that a wet clutch would be worn out at only 140k.
    I hope to pull the mech unit this week and do valves. It will depend on how quickly I can get them.

    Sent from my SM-G975F using Tapatalk

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37. 01-11-2020 02:09 PM

    
    

    #35

    

    
    Registered Member
    

    One Ring

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    You might get the same kit as CM02:
    https://maktrans.net/zaptchasti-akpp…01-mechatronic

    Based on wwhan’s post #4 within the link below, I would start with (no guarantees, but based on others symptoms/fixes sounds like it may work):
    — N472 (main pressure Valve) —> I think regular mechatronic repair kits come with the N471, but I believe they’re basically same
    — N435 (clutch K1 valve)
    — N439 (clutch K2 valve)

    https://www.audizine.com/forum/showt…nsmission-Code

    I’m planning to get mine fixed in the similar way soon (TCM + clutch). Good luck!

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38. 01-11-2020 07:40 PM

    
    

    #36

    

    
    Junior Member
    

    Two Rings

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    I believe the root cause of my issue (P17D4) was solenoid N472 (main pressure valve).

    Note that I also replaced N436, N449 and the wiring harnesses earlier is the process so they could have contributed as well. I probably have some abnormal clutch wear from driving around in this condition for so long but will deal with it when it craps out.

    It has been approx. 1500 miles since I replaced N472 and transmission shifts perfectly (stop to 1, stop to reverse, and 2 to 1).

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39. 03-04-2020 02:12 PM

    
    

    #37

    

    
    Junior Member
    

    One Ring

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    Did you apply compressed air to the clutches from the tubes that supply pressure to verify the operation of the clutch packs.

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40. 05-09-2021 04:24 PM

    
    

    #38

    

    
    Junior Member
    

    One Ring

    

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    2013 S5 with 79,714 miles.

    Ever since they updated transmission software (pre-covid) I have been having rough shifting from 1st to 2nd and 2nd to 1st as well as coming to a stop. Maybe a coincidence. A few days ago I got the dreaded transmission malfunction and TPMS malfunction simultaneously. I pulled over turned off the car and it cleared itself.

    My initial research had me thinking I was looking at the expensive and common problem of having to replace the mechatronics unit. Audi knows this is a widespread problem and should issue a recall to fix it or at least cover the repairs. My research shows that the manufacturer of the part knows there is an issue and hasn’t been able to fix it yet, however, there is a company in the UK that will repair it and guarantee the repair for $580 plus shipping.

    I just ran a scan of codes and it appears the codes I’m getting are the P0750 which says I have a «shift solenoid A» failure, and 8955 Valve 3 in partial transmission1 mechanical malfunction. Has anyone else had a similar issue? Did having «solenoid A» replaced fix the problem? I don’t want to just start fixing things to find that doesn’t solve the hard shift issue. Looks like the cost of the parts is about $100 and the labor cost should be between $250-500. Does anyone have any experience with this? What should I expect to have done to resolve the issue?

    Thanks for any input.

    David

    P0750 error no vin.PNG

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41. 10-03-2022 04:09 PM

    
    

    #39

    

    
    Senior Member
    

    Three Rings

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    Did the mech unit end up solving it for you? I have the exact same code.

    Originally Posted by A4Torque
    

    No unfortunately in my vehicle the new clutch did not fix anything….
    Just to clarify i replaced the entire clutch unit not just the friction plates. I was advised to do this incase the sealing rings for the hydraulics were worn. Apparently this can cause problems with the clutch unit also.
    I will turn my attention to the mech unit now and new valves.
    I guess at least the worst job is done and I shouldn’t have to pull the box out again.
    It did seem unusual that a wet clutch would be worn out at only 140k.
    I hope to pull the mech unit this week and do valves. It will depend on how quickly I can get them.

    Sent from my SM-G975F using Tapatalk

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