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Thread: S6 Avant Transmission Control Module

  1. #1
    Registered User
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    S6 Avant Transmission Control Module

    Transmission Control Module
    I have a 2002 S6 Avant with a transmission issue -- the car shifts into limp mode, but still drives - albeit very slowly w/o and torque. The P R N D S line is completely RED in the center cluster.
    I have received two opinions from Audi certified mechanics - one, the worst case scenario - the transmission is shot & the second is that it is the TCM - transmission control module - that is bad. The TCM is located underneath the passenger footwell carpet - must also remove seat to access this.
    -- Does anyone here know how to further diagnose whether the transmission is shot before I go down the TCM route (its an expensive 'try' - parts and labor to check it will come close to $1000.00 and part is not refundable) THANKS!

  2. #2
    Registered User hahnmgh63's Avatar
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    Feb 2007
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    Roy, WA
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    First you need a scan of the TCU, preferably with Vagcom or from a dealer to get an idea of the faults. Secondly, are you sure the seat has to be removed and the footwell carpet can't be just pulled back along with removing the trim piece where the carpet meets the door seal? HP24 was never a great transmission but there are some reputable rebuilders that do a good job, one of them is Tozo from Audizine and someone here probably has his E-mail or #, he's located in Chicago area.
    2003 White RS6 2013 Midnight Blue S5
    2013 Daytona RS5 2x944 Turbo's 1974 911 w/'91 3.6ltr motor
    Roy, WA

  3. #3
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    You don't have to remove the seat. TCM most likely had taken a swim. Take it out, have a look.

  4. #4
    Registered User
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    Jul 2019
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    3
    f125 maybe? you need to scan with vcds to see..

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