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Thread: Transmission issue. New to e66.

  1. #1
    Join Date
    Sep 2016
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    98 m3, 00 525i

    Transmission issue. New to e66.

    I just purchased a 1 owner 2002 745il with 117k miles.

    It drives fine until you go wot up a hill, or wot in reverse..

    At that point I get a transmission failsafe indication.

    My friend works at bmw and scanned the code.

    Does replacing the valve body seals, and mechatronic sleeve fix this issue?

    4F4B Gear monitoring R



    Heres a pic showing automatic transmission being replaced under warranty

    Last edited by Bmwpower603; 04-05-2018 at 07:34 PM.

  2. #2
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    Gear monitoring is indicating internal slippage in the trans. Valve body seals and a mechatronics seal will not likely fix anything. Time for a new trans or a rebuild.

    And the warranty history doesn't mean the transmission was replaced. You're seeing the defect code. The problem could have been addressed by a software update, torque converter replacement, or even a fluid drain and refill. Did you click on the claim number and actually read the tech's story and see what parts were replaced?

    Regardless that was 12 years ago, and over 100k miles ago, so that doesn't mean anything.
    ASE and BMW Master Certified Technician

  3. #3
    Join Date
    Sep 2016
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    98 m3, 00 525i
    Quote Originally Posted by White94RX View Post
    Gear monitoring is indicating internal slippage in the trans. Valve body seals and a mechatronics seal will not likely fix anything. Time for a new trans or a rebuild.

    And the warranty history doesn't mean the transmission was replaced. You're seeing the defect code. The problem could have been addressed by a software update, torque converter replacement, or even a fluid drain and refill. Did you click on the claim number and actually read the tech's story and see what parts were replaced?

    Regardless that was 12 years ago, and over 100k miles ago, so that doesn't mean anything.

    You have any recommendations to diagnostic tool that can register batteries with this vehicle. And check for airbag light malfunctions, and measuring blocks ?

  4. #4
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    I'm a dealer tech, so I only have experience with ISTA. There's a subforum for diagnostic equipment. You may be able to find some recommendations there.
    ASE and BMW Master Certified Technician

  5. #5
    Join Date
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    98 m3, 00 525i
    Quote Originally Posted by White94RX View Post
    I'm a dealer tech, so I only have experience with ISTA. There's a subforum for diagnostic equipment. You may be able to find some recommendations there.
    Cool. Thank you for the help.

    I did tran fluid top off. Because the fluid was low. I still get transmission fail light when down shifting on the highway

    Sounds like this tran needs some new clutch packs. Or maybe a valve body clean up?
    Last edited by Bmwpower603; 04-25-2018 at 07:45 PM.

  6. #6
    Join Date
    Apr 2018
    Location
    Warren, OH
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    13
    My Cars
    2006 E66, 2006 E61
    I also had transmission failsafe issues, especially when driving at freeway speeds then getting into city traffic. Shifting wasn’t smooth going into first at a stop either. I replaced the seals and solenoids in 2017 and haven’t had a problem since. The shifting is way better, but not perfect. I’m sure there was excessive wear due to the lack of service. I’m at 125k and hope to get to 200k before I need to rebuild/replace the trans. Just my 2 cents.

  7. #7
    Join Date
    Aug 2005
    Location
    Vancouver Washington
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    53
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    2004 BMW 760 Li 1991ZR1
    Hello, had same issue. A $25 dollar part $500 in labor that was in 2014. Transmission been running great.

    Manfred E........
    2004 BMW 760LI
    Last edited by Tomcat 74; 09-10-2018 at 06:13 PM.

  8. #8
    Join Date
    May 2018
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    Chicago,IL. USA
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    19
    My Cars
    2006 BMW 750i
    I had a similar problem I was getting code 4F89 , P17E8 , CF23 and some other code I took my car to a BMW Transmission Shop they wanted $4000 to change out the Mechatronic. I just did took the Mechatronic out myself and changed out all the Valve Body, Reset Adaptation drove for a 100 Miles and the car runs great.

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