Audi A4 2.0 multitronic problem
ALT engine
A4 B6

Multitronic gearbox is sliding on first gear but not on reverse
This problem appears after the gearbox control unit change

Even the adaptationprocess is not solving the problem.
Oil level in the gearbox is correct.


some updates :

I did a oil flush = same problem
i have checked and clean the ECU connector on the gearbox = same problem
i have done the adaptation process = same problem

The multitronic gearbox is based on two clutch system (no torque converter) :
- on set of clutch for the forward gears
- another set for the reverse gear

There is no specific gears in the clutch, it is a CVT system based on two variator dampers and 1 chain, which gives here 6 preset gears.


The problem was fore sure with the forward clutch :
- the forward clutch disks are may be worn out, but i doubt it as it occurs one day form nowhere
- the forward hydraulics system is failling
- the ECU is not applying the correct hydraulic pressure to engage the clutch (most probably)

but i never found out what causes the problem.
I sold the car as is, it is now in Africa. probably with a manual gearbox swap.

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