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      04-23-2019, 03:14 PM   #2
biz77
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Drives: 2021 X3 M40i
Join Date: Aug 2010
Location: Spokane, WA

iTrader: (4)

5-4 ratio monitoring. Could be as simple as the bridge seal and/or the other four seals between the valve body (mechatronic) and the transmission itself, but most likely a faulty solenoid.

Continuing to drive it like that can turn a simple fix into a major one.

I would attack this as follows...
Step 1:
New pan/filter
New fluid
New mechatronic sealing sleeve
New bridge seal and four round seals.

If that doesn't solve it:
Pull valve body and replace solenoids

If that doesn't solve it:
Rebuild yourself or have the valve body rebuilt.

If that doesn't solve it, then you've let the slipping occur for too long and you will need new clutches.
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