Question about 1994 BMW 3 Series

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Car shifts into trans module mode

This is actually for a 1994 BMW 740i.
Transmission might be slipping when this happens. Seems to only happen in cold months and when I shift into lower gears when cold out. Lately it has been happening in economy drive (normal).
Needs flush of transmission system? Owner guide just says that the transmission module has failed. When I turn car off for a bit and then restart it will perform like normal. Thank you for any advice you may have.

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  • alberts6 Nov 24, 2008

    Only happens in cold weather, like below 40 degrees.



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First lets look at what this moduel is looking at
this moduel sees line pressure and your gear selection P_R_N_D ect
and it has sensors or the input shaft and other gear sets.
so what we need to do is make arangement to have your codes pulled
so we can see to what extent the trouble could be.
otherwise we will all just be guessing.
and its your money that you are spending and
the object is to fix the problem with the least expence.
and with you beingt able to reset the code by turning off the ign switch tells me that its probily just a sensor problem.
let us know what code it has set

Posted on Nov 25, 2008

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The cars torque convertor maybe failing or slipping.

Posted on Nov 24, 2008


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The first thing to do is change the fluid and filter, if the filter is dirty and the fluid worn out then the problem may be fixed by a simple service, don't just flush the trans, the filter must be changed, ask for a fluid and filter service.

Posted on Nov 24, 2008

  • yadayada
    yadayada Nov 24, 2008

    smarttech I disagree, this would not be a torque converter issue.

  • yadayada
    yadayada Nov 24, 2008

    The trans fluid and filter is the cheapest way to approach this, how will u know unless u try it?


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