Yes your interlock cable sounds fine.

Did you happen to check that gear positions as reported by transmission match what is reported on display and gearshift positions?

With your solenoids showing as toast just buy a valve body, solenoid repair kit and have the old valve body checked for cracks. Don't forget a complete filter, seal kit to complete everything.

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When it shows on dash it's reported correctly, it also shift fine.
The issue is just when hot the car loose gear indicator on dash and it goes in trans failsafe.

Can a damaged valve body cause overheating? And failing solenoids no dash info about the gear position ?

And sometimes even when hot and no dash indicator just removing key and puting it back it works again (gear indicator comes back)

Yes a crack in the valve body can cause your problems and a malfunctioning transmission is working harder while still getting an ton of power shoved into it.

Rebuild kits aren't too expensive, just make sure of your exact model by checking the tag on the transmission. https://uploads.tapatalk-cdn.com/202...48611e1f1f.jpg

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A cracked valve body or failed solenoid can cause no gear indicator on dash ?
I saw these kits but I don't have the knowledge to do it myself :/

Leaks in the valve body no matter how they occur keep sending mixed or no signals to the computer and that is why it doesn't show, shift, etc.

When you were a kid did you play with any toys putting square pegs in square holes, round pegs in round holes?

Every put together any item from Ikea?

If you have then you can do the valve body. We are not taking about doing the drums/clutch packs or anything like that, only removing the oil pan and the valve body mechatronics sandwiched between the pan and the main body of the transmission.

If you're still nervous about it then I suggest you take it to an independent transmission place and see if they will rebuild it with your parts vs theirs and having a good idea of what's wrong should keep them from slipping you the high hard one...

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Ok thanks for the explanation.
If I go that route do I have to buy anything else ? Joints, o ring?

Sadly the solenoids for this 5hp24 model is only available in china for 120, or from zf at 1400euros :/
Valve body also only available in china (400euros).

Is it better to replace only the solenoids or since my gearbox is overheating it certainly cracked?

I don't think buying an used one even with less mileage is a good idea ?

Also can it be the solenoids if when trans failsafe + no dash indicator I can still do drive, reverse, park, neutral without any issue ?

https://www.pieces-bmw.fr/

https://www.online-pieces.fr/bmw-pie...hp?language=fr

https://www.daparto.fr/pieces-auto/B...hoCDygQAvD_BwE

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Thanks for the links.

So I'm driving the car myself now and actually with engine cold I never have the prnd on dash and it goes into trans failsafe. When engine reach 60degrees approximately or sometimes only when it reach operating temperature I just have to cut engine and start again and it works normally. I can go full throttle each gear in manual or automatic mode with 0 issue.

Error codes are EGS line signal disturbed and solenoid 1.