Hesitation issues when idrive is shifting from 2nd to 3rd on acceleration & deccelatation

2004 BMW 545I
110,000 MILES
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DONNA0603
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Noticed first on acceleration there would be a hesitation when shifting from 2nd to 3rd and when deceleration it shifts very hard from 3rd to 2nd. When I use the manual shifting there are no problems. Does anyone know what the problem might be?
Apr 11, 2012 at 6:58 PM
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JACOBANDNICKOLAS
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It sounds like it may be with the TCM (transmission control module). Have the computer scanned to see if there are any trouble codes. Most parts stores will do it for free.
Apr 11, 2012 at 8:42 PM
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DONNA0603
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So far there have been no codes. I have a OBD tester.
Apr 11, 2012 at 9:21 PM
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JACOBANDNICKOLAS
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Is your OBD tester able to read codes other than engine codes? The ones to read all codes, trans, ABS... are very expensive and most people don't purchase them.

Let me know.
Apr 11, 2012 at 9:25 PM
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DONNA0603
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My tester is only able to read codes for the engine. I will take it to an Auto Zone tomorrow. I'll get back with you when I have the test ran and tell you what the results show. Thank you very much.
Apr 11, 2012 at 11:35 PM
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JACOBANDNICKOLAS
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Keep in mind, most of the parts stores may not have the right scanner either.
Apr 12, 2012 at 12:34 AM
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DONNA0603
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What should I ask for to make sure their scanner is the right one?
Apr 12, 2012 at 3:01 PM
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DOCHAGERTY
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The issue is very possibly software related.
Oct 21, 2012 at 1:49 AM
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