Diesel auto gearbox issue
 

Hi all,

My dad's 04 year MKII 75 has decided to kick up a gearbox issue since this morning. All was fine yesterday but this morning when he selected drive the gearbox aggressively clonks into gear, even when you first select drive or reverse from park with your foot still planted on the brakes.

Every gear change is then extremely harsh, as if it is banging into gear.

I done a battery reset to rule out the off chance it's just a electrical glitch with the gearbox ECU, and that actually cured it. I was able to drive a couple miles with no issues what so ever. However as soon as I put it in reverse the problem returned.

So after a batter reset it'll drive fine as long as I don't use reverse gear. I believe the issue must have started last night when he reverse it onto the driveway.

Any ideas what the problem could be? It's not going to be as simple as just needing a gearbox oil change is it? Is this signs of the cracked reverse piston issue? Although I thought that was a problem only with the earlier models?

Many thanks
Rick

Hi Rick,

Sounds like a solenoid issue?

Mike

Read HERE, and test

There's a test procedure,to check the solenoids resistance,to narrow it down ,somewhere Rick.
Also worth checking wiring and connections.

Costs nothing to try the potentiometer as this cured a similar problem for John Aston who attends our Nano meets

put the ignition on II

without starting the car press the accelerator 10 times to the floor

It's been a few years since I had to sort an auto box problem on one of these, but X702UOK was suffering the same issue of very harsh changes when I found it - the main reason it was scrapped. As you went up through the gears, you felt each change would put you through the screen !

Fortunately, it was nothing more than the 2/4 duty solenoid (about £70 from memory), and it can be easily replaced with the car on ramps and a couple hours to get inside the valve chest, right on the front of the box.

Not sure about the reverse piston, but again I believe it's accessible externally, so no need to remove the box, making it a much simpler fix. All our cars are getting old now, so even a late model could find this problem starting to appear.

Good luck.

Thanks all for the replies. Tested the solenoids and looks like it's definitely the 2/4 duty solenoid.

Going to order the new solenoid from DMGRS. Can anyone advise if this is the correct gasket for the gearbox? https://www.ebay.co.uk/itm/VW-Jaguar...tdvAENoZJWXIJM

And also is this the correct oil? https://www.ebay.co.uk/itm/234077651...Owq3bw9Otll1EY

And how much oil is needed? ? I'm seeing conflicting info on threads and posts, some say around 4l others say 7l?

Thanks

The gasket looks to be correct.

The oil though, it depends of it states n402.. since it is a universal one, (that others have apparently used successfully), and the proper one is available for similar money, I would go for the proper one.

Search ebay for smith allen n402.

The volume is dependant on your method. 4 litres is all that can be done.with a basic drain, but there is a how to, to do.a complete change, which is around the 8 litre volume.

Search the forum for beinet1 post about it. It has been added to in the past day or two

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