Question about 1991 BMW 7 Series

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Auto transmission; " trans program" light comes on intermittently, when light comes on transmission doesn't shift normally(very slowly) mechanic hasn't been able to diagnose because can't duplicate problem in shop

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  • srrubin22 Sep 13, 2010

    How expensive to replace these are these?

  • izear kegler Oct 31, 2012

    my 735il 1991bmw will not reverse

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  • BMW Master
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You will need to be able to scan the car and read the faults, but it sounds like maybe the shift module on the side of the tranny is not sending the Park or Neutral message to the DME so the car does not know that it can start because it needs to see that the car is in park or neutral to be able to start, but you really need to be able to scan the DME or the EGS to be able to know.

1. Try the Reset but you may need to disconnected the + and - cables together of few minutes to clear all memory
2. Check for damaged wire on the tranny or leaking
3. Change the tranny fluid and filter
4. Take it to the dealer or a well equipped BMW shop that can pull tranny codes.

Hope helps.

Posted on Sep 13, 2010

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  • BMW Master
  • 75,817 Answers

This can be caused by either a defective connection to the transmission control shift solenoids at the transmission case or a defective transmission control module (TCM), without duplicating the problem it is imposs to say which is at fault

Posted on Sep 13, 2010

  • yadayada
    yadayada Sep 13, 2010

    replace what? u don't know what the problem is yet, don't put any parts in until a tranny shop has confirmed the problem

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