The code 13 (intermittant 109) WAS probably the problem! You need to readapt the trans by driving VERY slow. You must let the trans up shift thru all gears 1st to 5th (2 times) & back to stop keeping the RPM below 1950 RPM & then letting the engine idle for 10 minutes.

If the harsh shifting is still there then TRANS codes need to be read again assuming they erased those previous codes!

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