Question about BMW 328

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How do you know if it's your TCM or your transmission that is faulty?

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  • klwm68 May 02, 2010

    without warning, it became stuck in low gear. The rpms rev up to 5000+ but there is no power.

  • klwm68 May 02, 2010

    No. Tried switching it to manual but it wouldn't shift. The three codes we have are P1421, P1423, & P0730

  • klwm68 May 03, 2010

    Thanks for your help.

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That's tough to tell without a professional scan tool, line pressure tests and lots of experience

that being said... could you tel me the concerns you are having?

I might be able to give you some feedback based on my experience and access to BMW service materials


Posted on May 02, 2010

  • Sean Reisdorf
    Sean Reisdorf May 02, 2010

    can you shift the transmission manually?



  • Sean Reisdorf
    Sean Reisdorf May 03, 2010

    ok... well the P0730 code is a trans code, but only sets when RPMs do not match gear selection... as for the other codes, those are engine codes for the air induction system

    so based on your information of not being able to shift manually you are probably looking at either a torque converter issue or trans

    bottom line... get this to a garage in the morning



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