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    Thread: Jetta HARD DOWNSHIFT to First Gear - Any ideas why?

    1. 06-17-2008 11:19 AM #1
      My 2001 Automatic Transmission Jetta GLS does a hard 'thump' to first gear when you slow down. Could low-tranny fluid cause this? Anyone with a similiar problem? Car has 126k on the clock, and has recently had a fluid/filter change on the tranny.

      Thanks for any info.


    2. 07-07-2008 06:00 PM #2
      Not trying to hijack your thread, but I've noticed mine does a hard shift, almost jumps and hits real hard if I'm cruising along and have to slow down quickly, for example to let someone in front of me turn. When I accelerate again sometimes it jumps HARD! Any idea what this could be or what to do to fix it if it needs to be fixed?

    3. 07-08-2008 03:22 AM #3

    4. 07-08-2008 11:34 AM #4
      it's gotten worse... now it vibrates and slips into what I think is actually 2nd gear... you have to let off the gas to let it "engage"... once its going its fine, its just slowing down and getting started. I have an appointment with AAMCO in the morning. My friends father-in-law owns it so I hope I don't get raped too bad. My mechanic is supposed to foot the bill. He forgot to install the spacers in the tranny pan gasket, and I drove back from Vermont with low fluid which I think completely finished the job of killing the tranny. Still driving it, but not sure for how long before it totally konks out.

    5. 07-08-2008 05:57 PM #5
      I'd be interested in what you find out, mine is doing about the same... odd that no one else has commented on this, I was under the impression this is a fairly common problem!

    6. Member GolfGuy2003's Avatar
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      07-09-2008 08:29 PM #6
      Is this a common thing with MKIV? Happened to me as well, now it go so bad it's sitting in the parking lot of VW probably for the next week and a half.

      I'm starting to think VW's are just as bad as Chryslers when it comes to their transmissions.


    7. 07-10-2008 02:48 PM #7
      Happens in mine as well..
      Changed ATF and Filter but does not fix issue.
      Will try to change fluid again in a couple at the next oil Change.
      Heard that the Line Pressure Mod might fix it. Have not tried it.

      http://forums.tdiclub.com/show...62154

      I just Switch to "N" if I know I'm going to come to a complete stop.


    8. 07-10-2008 04:30 PM #8
      Aamco+guessing=$$$$$$$+

    9. Member sledge0001's Avatar
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      07-11-2008 12:07 PM #9
      Try getting vag-com and to a throttle body alignmnet and a transmission adaption. This really made a difference on my cars up shifts and down shifting

      ThrottleBody:

      Procedure for performing a Throttle Body Alignment on DBW Cars using KWP-1281:
      (Check to see if the engine speaks KWP-1281 by looking in the top left of the Open Controller Screen Some examples of KWP-1281 engine controllers are 2000+ Golf/GTI/Jetta/New Beetle/Audit TT 1.8T)

      Turn the key on but do not start the car.

      [Select]
      [01 - Engine]
      [Measuring Blocks - 08]
      Group 060
      [Go!]
      [Switch to basic settings]
      Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
      [Switch to Meas. Blocks] button and you're all set.

      Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!


      --------------------------------------------------------------------------------

      Procedure for performing a Throttle Body Alignment on DBW Cars using KWP-2089:
      (Check to see if the engine speaks KWP- 2089 by looking in the top left of the Open Controller Screen Some examples of KWP-2089 engine controllers are 2002+ Audi A4, 2002+ VW Passat, and Touareg)

      Turn the key on but do not start the car.

      [Select]
      [01 - Engine]
      [Basic Settings - 04]
      Group 060
      [Go!]
      It should say "Basic Settings: OFF" on the top of your screen.
      Click [ON/OFF/Next] to turn on Basic Settings.
      It should now say "Basic Settings: ON" on the top of your screen.
      Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switched basic settings on. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
      Click [ON/OFF/Next] to turn off Basic Settings.
      It should now say "Basic Settings: OFF" on the top of your screen
      Click the [Done, Go Back] button and you're all set.

      Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

      Okay now on to the transmission;


      First, make sure there are no fault codes in the Auto Trans. Then, with the key in the on position, and engine OFF. Do not touch the accelerator pedal.

      [Select]
      [02 - Auto Trans]
      [Basic Settings - 04]
      Set Group to "000"
      [Go!]
      Press accelerator pedal all the way to the floor and count out loud 3 seconds.
      [Done, Go Back]
      Release the accelerator pedal.

      It is normal for there to be no explicit instructions or changes on the screen when you do the above procedure. The transmission controller does not provide any feedback that it has been successfully performed.


      --------------------------------------------------------------------------------

      Note: In some newer Audi vehicles, you may find that Group 000 in Auto Trans. is unavailable. If that is the case, you should follow this procedure:


      --------------------------------------------------------------------------------

      First, make sure there are no fault codes in the Auto Trans. Then, with the key in the on position, and engine OFF. Do not touch the accelerator pedal.

      [Select]
      [01 - Engine]
      [Basic Settings - 04]
      Set Group to "063"
      [Go!]
      Press accelerator pedal all the way to the floor and count out loud 3 seconds.
      [Done, Go Back]
      Release the accelerator pedal.

      Quote Originally Posted by Arin@APR View Post
      I'm outta here... you guys are idiots. You can quote me on that and throw it in all of your sigs.

    10. 07-12-2008 08:35 PM #10
      I have the same problem. See my earlier post: http://forums.vwvortex.com/zerothread?id=3873857

      Changing the ATF and filter indeed does not solve the problem.

      Did anyone try the throttle body alignment suggested by sledge0001? Why should throttle body alignment help?


      Modified by xyz_1982 at 4:36 PM 7-12-2008


      Modified by xyz_1982 at 4:37 PM 7-12-2008


    11. Member sledge0001's Avatar
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      07-13-2008 01:29 AM #11
      I was told that after making any change to your engine like valves, vacuum tubing or anything that it is wise to do both

      I can tell you that it did help with my 2nd to 3rd slip in D. in S mode I had no slippage..

      Quote Originally Posted by Arin@APR View Post
      I'm outta here... you guys are idiots. You can quote me on that and throw it in all of your sigs.

    12. Member GolfGuy2003's Avatar
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      07-15-2008 10:59 AM #12
      I need a whole new transmission!!!!

    13. 08-08-2008 01:33 AM #13
      Regarding the harsh downshift to 1st, I took my car to a transmission specialist today.

      They testdrove the car and said it is not the transmission. They said the TCU is shifting at the wrong time which can be most likely fixed by doing throttle body alignment, cleaning the throttle body, or replacing the air flow mass sensor, etc.

      I didn't have time to leave the car in the shop for them to do the full diagnostics, hence the suggestions what to do are vague.

      Did anyone try the throttle body cleaning, etc?


    14. Member mk3love4life's Avatar
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      08-11-2008 11:31 PM #14
      I have the same problem with my car shifting hard into 1st so i am going to try cleaning my throttle body and going from there!

    15. Member GolfGuy2003's Avatar
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      08-11-2008 11:33 PM #15
      I think I'm done with VW's... I want a Honda Fit

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