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Thread: A4 B6 CVT TCU HELP repaired but NO GEARS HELP !!?

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  1. A4 B6 CVT TCU HELP repaired but NO GEARS HELP !!? 
    #1
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    Hi all

    Audi A4 B6 CVT autobox: NO GEARS ENGAGING please HELP !

    I was having slight issues with the dashboard PRNDS lights flashing when the car got warm and I selected reverse, sometimes the car would not engage reverse, but after moving into Park then back to reverse it would engage, the PRNDS then would stop flashing when selecting D again.
    This was the only issue I had, I got the codes read and it stated:

    17090 - Transmission Range Sensor (F125): Implausible Signal.

    I decided to remove the TCU from the back of the CVT box, inside the TCU I saw that there was gearbox oil and loose contacts, I could see it had been repaired before as the sealant had leaked ! I re-soldered 2 contacts and re-sealed the unit properly, put it back on the car but after about 10 secs the dash beeps and I get the BRAKE warning, ABS and TRACTION control lights on dash with NO GEARS so the car is stuck!!! The fault code is:

    P1647

    I took the TCU off again and took it to a repair place locally, he said there were other loose connection that he repaired and he tested the unit and all was working and fixed or so I believed !?
    But I have put the TCU back on the car and the same problem as with no gears and warning on dash is still there !?

    I have tried disconnecting the battery thats all, is there anything I can do now HELP !?
     
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  2. Re: A4 B6 CVT TCU HELP repaired but NO GEARS HELP !!? 
    #2
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    I found this on the site for an A6 it might help point you in the right direction.

    So an update if anyone stumbles across this problem.


    After much searching and many vag com plug ins I managed to figure out that the abs module had lost its coding somehow. I was told the gearbox had been replaced at some point if that would cause a problem?

    So it was quite easy. Plug in the vag com and open the program, turn ignition on.

    Go to options and test the link, all ok.

    Go to abs, coding, change the code from 00032 to 00011 in the soft code box, press do it!

    The light on the dash turns off happy days.

    Press exit, exit, exit until the program closes, turn off ignition, unplug vag com lead.

    Whilst I was there I turned off the active gearbox setting by going into the transmission button and the same as the abs change the code from 00000 to 00010,
     
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