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Exactly what 5 series is this, the mileage, and model year? 95% of the time a slipping transmission is caused by an issue with the mechatronics unit. It is the mechanical/electronic module that controls the transmission. The seals and/or solenoids will fail and that will lead to a slipping transmission. There are many threads on this forum and others documenting the service of the transmission/mechatronics unit.
It's a little bit involved but this can easily be serviced by any DIY with a little bit of patience. I think I could perform the service on our vehicles in less than 5 hrs now. Anyhow, it's extremely rare that the transmission would need to be replaced. In fact, I only know of one case in which a highly qualified DIY/Mechanic opted to replace his transmission. It was a very unique situation for him though, as I recall.
Ralph
Last edited by Ralph III; 03-25-2024 at 10:38 PM..
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