I recently bought a V50 2004 2.4i With automatic transmission. it had an engine failure, that I new about. So i got a new “used” engine with 150’000 km and it works perfectly fine. But I noticed really bad looking oil in the gearbox as I was changing the fluids. But used the grearbox anyway and as I was mounting it to the new engine I broke off the pins that are maching with the converter unit, that I realized only when I lost the gears during the test drive over 80kmh...

So i decided to get a new “used” gearbox with converter from a junk yard. The oil in it was nice and red, It was driven 160’000km so I was happy until I turned on the car... It now shows an error “ Transmission service required”
And there is a loud sound coming from underneath the pan where electronic parts are located on the gearbox, it goes quiet when put in Drive.

When put in reverce it has a stong kick.

Seems like it is only driving in 4gear. that’s what I see in the diaplay. and it doesn’t allow to manually shift gears.

I was wondering if there is an electronic issue that I could solve by using parts from my old gearbox?

I don’t feel like buying another gearbox and doing the crazy 12h job again, without guarantees..

Any advice and help will be highly appreciated!

my shift solenoid replacement

Thank you for info! I will hook it up to the computer tomorrow and see what comes out.
The new tranny is at least with the same Code AW55-50SN