Chris NottMonster Motorsport
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  1. #1
    Reverse Gear

    Join Date
    Dec 2013

    Audi A4 B6 Multitronic Gearbox (18034)


    I'm a owner of an Audi A4 B6 04 plate with a multitronic gearbox transmission. Its has been a couple of weeks now that when i am driving in normal conditions after 5 to 10 mins the transmisson will loose all gears and the PRNDS lights will start to flash on the dash.

    Having this problem occur now all the time i had someone come round to read the TCM on the gearbox and the faults showed up as DTC 18034 CAN engine/transmission communication, missing message - intermittent.

    Now i was adviced to have the TCM checked out so i did i sent TCM off to have it tested and the report come back as TCM was working as it should do meaning no faults found.

    I want to know if anyone has had this problem before and if so what was the casue..?

    also does anyone have any wiring diagrams on the TCM side of things from ECU to tcm..?

    please help.

    Cheers ziggy
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  3. #2
    S4_dan's Avatar
    Fire up the Quattro!

    Join Date
    Jan 2006
    Somewhere in the Howardian Hills!
    Hi and Welcome. When the PRND lights up in bold red/flashes this normally indicates that the ECU is faulty. As you have suggested already. I would be inclined to get a 2nd opinion on the ECU.

    Otherwise it sounds like a chase of the wiring harness and searching for a broken wire/chaffed wiring/Insecure connectors etc....

    Try using VCDS for a scan to see if it offers any other codes.

    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  4. #3
    1st Gear

    Join Date
    Oct 2013
    Wiring gremlins are sad times, I hope you get it sorted dude, let us know how your investigations go.



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