Hi all,

I have been looking into replacing the TCM on the e320 to try and cure the lockup vibration. MB want over £500UKP for the part, and then it needs coding to the car.

Not being funny, but thats just crazy.

Does anyone know of an software upgrade process available for my existing TCM, or another alternative?

Kind regards,

Mike

Did you try a transmission fluid flush. Did you check the for glycol contamination You dealer should know if there’s a soft ware update,

Hi again,

Fluid is fine and checked.

I'm now wondering if my problem stems from the driveshaft... as vibration is felt right upto higher speeds now, and this entire fault has developed over 12 months or so.

Under light load (and torque lockup), the car pulls erratically (but in a subtle way... you have to watch the revs)... with the rpm needle wobbling up and down. This as I said - goes upto whatever speed you like, usually in top gear.

I'm therefore not conviced the tranny control unit would need replacing. I think this is drive shaft related, and the torque converter lockup is putting the drive shaft components under conditions in which they vibrate. IE. direct drive... with no power slip.

How does this sound to rest of you? Am I onto something?

I am booked in to see MB next week and will report back, but I want to go armed with as much infor as possible.

No software updates are available for mine, already checked... and the tech recommended prop shaft... how they will tell I dont know.

I just want to get a decent diagnosis, without the massive cost of just "trying to change things it might be". I'm not under warranty so that exercise could run up huge bills. Not into that.

I love the car, but this problem really spoils the whole thing for me... would just like it fixed... and am happy to pay for it - as long as I know whats causing it.

Your thoughts and comments are appreciated, as always.

Kind regards,

Mike Freeman