Gear change

Tiny
SANDY FRASER
  • MEMBER
  • 2003 MINI COOPER
  • AUTOMATIC
  • 158,000 MILES
My transmission changes gear very erratically, moving from start, it will change down instead of up. Sometimes it's fine?
Thursday, December 12th, 2019 AT 4:31 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
We need to start with checking fluid and then monitor the commanded gear with the scan tool. If the commanded gear is not achieved we need to inspect inside the unit for metal. Depending on these findings will direct where to go. If the transmission is following the commanded gear and they are not correct then the control module is the issue.

I would suggest starting with checking for codes and go from there. However, if there are no codes then we need to check fluid condition and level, commanded gear vs actual, and then for metal in the unit.
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Friday, December 13th, 2019 AT 5:22 PM

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