The transmission for the BMW 650i is known to have a few issues. The main ones include the transmission shaking or causing a grinding noise when You shift gears. If You purchased this vehicle used it's possible that the wrong transmission fluid was used in it which could have caused damage. You need to make sure that You're always using the correct type but also go ahead and use BMW's own brand of fluid. If Your transmission is losing power and not shifting gears then You may have an electrical issue.
gary
June 18, 2021
When stopping the automatic transmission makes a lurching move to first gear. The 6 speed auto shifts OK and does not make any noise etc. It only has 33,000 miles and is a 2010 650I. Slow stop seems to create this problem. Should I see BMW dealer to locate problem/
Thomas J
July 30, 2020
BMW 650i transmission problems usually lead to the vehicle shifting rough between gears.
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