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BMW Automatic Transmission Fault Codes – Torque Converter?

February 17, 2011

This answer is applicable for many BMWs in addition to the one listed below.

Q
car year: 1999
car model: 528i
My check engine light comes and goes. I just had the code checked by a mechanic. He said that the code indicates the torque converter and transmission are not syncing up? The transmission does not shift as smoothly as it did. There are 88,000 miles. He said changing the transmission fluid might help or make it worse. Worse because new oil may allow seals to leak. What do you suggest?

A
It may be helpful to have the actual fault code and description.  The mechanic has just given you a generic reply to whatever the code actually was.  Can you describe in more detail exactly what the transmission is doing, under what specific conditions, as well as obtaining the actual fault code?

In the mean-time, yes, it would be a good idea to change the fluid and filter.  This may indeed improve the operation, and it certainly will help to extend the transmission’s life.  A fresh fluid change will not cause leaks or other negative problems.

Automatic transmission filters:
BMW

Automatic transmission fluid:
BMW

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