Trans failsafe + no gear indicator on dash

[Supr4]

Hello everyone

New issue on the X

So to resume the car would get into trans failsafe and also no gear indicator on dash, it drive but in limp mode. Sometimes getting the key off for 30seconds and key on again fixes it.

It works or doesn't work after turning the key then stay working or not working until next key off/on. It doesn't happen while driving when the issue isn't present.

But since today it refuse to work again no matter what, I didn't try clearing the codes again.

Codes are:
P0753 shift solenoid 'A' electrical
On dis: solenoid valve 1

So is it simply the solenoid or it could be something else or low oil in the transmission?