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2012 X3 F25 transmission slipping

Discussion in 'Pacific Region' started by Fishguy, Mar 19, 2018.

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    Fishguy

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    My 2012 X3 F25 8 speed automatic transmission is slipping in lower gears mostly when cold. Will a fluid and filter/pan change help?
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    charlson89

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    First need to check for any leaks on the transmission. Also I have ran into a engine misfire that can be mistaken as a transmission slip, need to make sure that isn't happening. If the transmission isn't leaking, I doubt a fluid change will help. If the trans is slipping there is a internal issue (most likely a clutch pack). Another thing to check is the transfer case this can also cause a transmission slip feeling. If you unplug the transfer case motor and the slip is gone then the transfer case is most likely the issue.
    Fishguy likes this.
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    Fishguy

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    Rats. Guess ill have to take it in to a mechanic as I don't know where the electric motor for the transfer case is. Wouldn't a misfire show up as an engine fault?
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    MGarrison

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    Peruse the parts diagrams @ realoem.com, might help with locating it -
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    charlson89

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    Not always in my experience does it trip a fault. You think it would though.
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    Fishguy

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    OK thanks, I shall endeavor to persevere.
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    Fishguy

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    BTW, how do I tell the computer I've performed a service?
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    charlson89

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    You need Bmw software that can talk to the egs module and reset the oil service counter and transmission adaptations.
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    Fishguy

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    You're good, it was a bad coil. Couldn't get the computer to declare a fault code so I replaced them all and PRESTO all is well.
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    Fishguy

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    Thanks for that realoem tip. I've used it several times already.
    MGarrison likes this.

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