A6 Gearbox ECU removal, is this it?

[Nev.d.y]

I have the usual well documented wet carpets in the car syndrome. I have since sorted where the water is leaking and of course have a gearbox issue. The car is an A6 2.5TDI Allroad year 2000 UK car (right hand drive). It has a tiptronic gearbox.
As documented in previous threads I have the PRND432 all lighting at once and the car dropping into limp mode.
I have pulled the carpet up on the passenger side and found what I hope to be the gearbox ecu. I have removed the box and all the connections from the unit. Reading other threads I am a bit confused as to wether this is the correct unit or a convenience unit that controls all the central locking etc.
Do I have to remove the seat to find the gearbox ecu or is this the correct unit?
The part number on the top is as follows; 4B0 962 258 H
It also has Turverriegelung on the case and a further number below the above number. It says VDO 410 215/006/008.
And another thing, it has a small white printed block which has the following on it; 478 02/01
All of you specialists who contribute to this forum deserve a good pat on the back, having read some of the assistance you offer it is great to see there are other good people around!
Apologies this has become a long thread.

[iwaters]

The part no you have quoted is for the Central Convience Unit, The gear box ECU is behind the A pillar trim on the drivers side. Have to remove the a pillar trim and the sill trim. The outer a pillar trim prises off then there are a couple of bolts to remove the rest of the trim.

The gearbox problem is not related to the wet carpets. Does sound like the gearbox ecu is *******.

[Nev.d.y]

Thanks for the info, there I am ripping up the wrong side! Yes it does sound like the gearbox ecu is tired. The drivers side was 2 inches under water though, so i may pull it out and get it tested just in case it got wet. I had water coming in through the bonnet release cable gromet right over the A pillar. Thanks for your response.

[iwaters]

Ah in that case then yes the gearbox ECU may have just got wet. You might just get away with drying it out.

[Peter D]

Enough guessing. You need to tell us the gearbox code form the ID label in the spare wheel bay. The Gearbox ECU may be iside the gearbox. Regards Peter

[iwaters]

Ah sorry, I thought the tips all had the ECU behind the A Pillar and the Multis had them in the gear box? :Blush2:

Lack of experience on my part!

[Peter D]

Yep but simply stating the gearbox code will clarify the situation no end. Regards Peter

[iwaters]

Yep but simply stating the gearbox code will clarify the situation no end. Regards Peter

Yes good point. It would be useful if the new thread form had seperate fields for Engine/Gearbox code and Year which had to be filled in.

Mods - One for the change sheet please!

[Nev.d.y]

Thanks to you both but the ecu for the gearbox is under the floor on the drivers side.
It is contained in a plastic box just as the other side.
Well here's how I got on.
The floor was of course still wet through. I managed to soak up much of the excess water and removed the ecu and plastic box. I took the aluminium cover off the ecu and set about it with the wife's hairdryer on cold. This dried out the ecu itself. I then put the aluminium cover back on.
I then set the hairdryer onto the block of wires that attach to the ecu. After an hour or so, I reconnected everything and it all works fine. Took it for a 20 mile test drive and not one error. All I need to do now, is hope that the repair I made to the bonnet release cable and removal of the grommet beneath the servo are enough to stop the water getting in again. Now I just need the car to dry out, that may take some time given the amount of foam under the carpets which hold the damp.

[iwaters]

That's great that you got it sorted. Will take ages to get the carpets dry worth using the air conditioner in the car on hot as that will also remove some of the mositure from the air.

[Peter D]

This can be a plenum chamber water problem but can also be the seal failing under the ECU electronics box and the water can enter without the plenum chamber being full of water. Any debris (leaves etc ) stuck behind and to the side of the box will not help. You will have to lift the carpet with blocks of wood and a fan heater securely positioned for many hours. Also you will/may find the rear carpets are wet underneath. Regards Peter

[neil-w]

Apologies for jumping in here, never used a forum before was just trying to find some help myself. I have a 2002 Automatic A6 2.4SE multitronic. Which has a few problems, not sure if they are linked but they are

Reverse gear doesn't always engage properly
Gear selection on dash constantly flashes
Car almost seems to stall sometimes when slowing down to approach a junction
Seems to jump out of gear, though not for a while now.

Engine management light is on now, though has done this in the past and gone out after a while

A local gearbox specialist quoteD at least £1250 to sort this out, car is barely worth £500 as electric windows are a problem too, though thats a minor detail at the moment, so I am just driving it into the ground till it stops one day!

Was suggested to check the transmission fluid level, but that seems none to straightforward, is there a warning light for this anyway, I think it is a sealed unit so should last the life of the car? Is this right?

Read some threads listing some of the above faults could be down to the ECU, which I thought would be within the gear box, but could be inside the car?

Also there are companys that seem to recondition these for around £200 is this worth doing.

Sorry to ramble on

Any help greatly appreciated

Thanks
Neil









I have the usual well documented wet carpets in the car syndrome. I have since sorted where the water is leaking and of course have a gearbox issue. The car is an A6 2.5TDI Allroad year 2000 UK car (right hand drive). It has a tiptronic gearbox.
As documented in previous threads I have the PRND432 all lighting at once and the car dropping into limp mode.
I have pulled the carpet up on the passenger side and found what I hope to be the gearbox ecu. I have removed the box and all the connections from the unit. Reading other threads I am a bit confused as to wether this is the correct unit or a convenience unit that controls all the central locking etc.
Do I have to remove the seat to find the gearbox ecu or is this the correct unit?
The part number on the top is as follows; 4B0 962 258 H
It also has Turverriegelung on the case and a further number below the above number. It says VDO 410 215/006/008.
And another thing, it has a small white printed block which has the following on it; 478 02/01
All of you specialists who contribute to this forum deserve a good pat on the back, having read some of the assistance you offer it is great to see there are other good people around!
Apologies this has become a long thread.

[Weaton5]

I have read that the numbers in the boot will tell you were the ecu is for the gear box can any one help
LX72/LX72NIH/MB
IDENT NO WAU222 4B45N008798 THE 4 AFTER THE BREAK IS A SMALL ONE
TYPE 4B5 06H
A6AVANT 1.9 TDI