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Thread: n54 335i auto trans problems

  1. #1
    Join Date
    Jun 2019
    Location
    inland empire, ca
    Posts
    5
    My Cars
    2009 335i

    n54 335i auto trans problems

    Hey guys ive been googling for a answer but recently i have noticed a rattling sound coming from my transmission area when warmed up and now anytime i hit about 6000 rpms or so my car jerks and goes out of gear. a gear symbol pops up and also the check engine soon brake light and both turning signals light up. today while messing around with a rx-8 i had the same transmission jerk problem and my rpms were bouncing all over the gauge. I am planning on doing a transmission flush and change the filter or is it too late? i have had the car for 6 months with 147k miles and from my knowledge it has never had a trans flush. any advice helps thank you.

    the mods are jb4, injen intake, active autoworks chargepipe with tial bov and a borla s-type exhaust if that affects anything.

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Read the faults

  3. #3
    Join Date
    Jan 2007
    Location
    .
    Posts
    7,708
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    Correct. Trying to fix a problem without reading the fault codes is like going to the doctor and telling him something is wrong and asking him to guess what it is.
    ASE and BMW Master Certified Technician

  4. #4
    Join Date
    Aug 2008
    Location
    North Potomac, MD
    Posts
    1,054
    My Cars
    2011 E90 328i
    Rattling could be anything including a loose cat heat shield.

    At 6K rpm, you could be dealing with a fuel cutoff issue, and a weak trans. Does it pop out in all the gears, or only the top gear?

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