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BMW Pro.
BMW Pro., BMW Technician
Category: BMW
Satisfied Customers: 779
Experience:  9 years main dealer experience.
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Experiencing hard downshift in automatic transmission at less

Customer Question

Experiencing hard downshift in automatic transmission at less than 15 mph. Is this something that can be taken care of electronically or must be mechanically or both?
Submitted: 8 years ago.
Category: BMW
Expert:  BMW Pro. replied 8 years ago.

Hi,

 

if I remember rightly there was a technical issue with the transmission software of some 7 series relating to a very harsh second to first down shift ie when coming to a stop. The rectification for this was simply a software update. You will need to contact your dealer to confirm this and have the fault codes read from your vehicle. The worst case scenario would be a mechanical transmission fault but I would consider this unlikely as I cannot personally recall ever changing a transmission on this model.

 

 

Rich.

BMW Pro. and 3 other BMW Specialists are ready to help you
Customer: replied 8 years ago.
If I purchase a OBD reader, is this something I can fix myself, or, what other equipment should I look into.

Thanks!
Expert:  BMW Pro. replied 8 years ago.

An OBD reader is always useful but not so much in this situation. The tech at your dealer will read the fault codes from your transmission ECU and then use these fault codes to search on the BMW technical website (Puma) for any current issues. If the cause is a software issue then i'm afraid it can only be rectified by either your dealer or a very very well equipped specialist.

 

Rich.

BMW Pro. and 3 other BMW Specialists are ready to help you
Customer: replied 8 years ago.
thanks for the second answer. I did "accept" after the first question. Hope don't get charged twice.

Thanks again!

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