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Thread: Transmission Failsafe / RPM acts up sometimes / car dies when i come to a stop

  1. #1
    Join Date
    Apr 2017
    Location
    Burbank, CA
    Posts
    10
    My Cars
    2007 BMW 525i

    Transmission Failsafe / RPM acts up sometimes / car dies when i come to a stop

    Hi everyone,
    So i have a BMW 525i 2007 (E60) 150000miles

    The codes I get from the OBDII are
    P1727
    P0335 Crankshaft positioning sensor (A circuit)
    P0700 Transmission Control System (MIL request)

    Every 20-30 miles or so the transmission goes into a failsafe mode and I have to stop and restart the car several times till it goes away. When on Failsafe mode, I try to restart it, the car takes around 5-10 sec before it starts and when it does that it still goes on failsafe. When restarting 3-4 times it evantually starts fast (1-3 sec) and is not in a failsafe mode.

    Everytime the problem acts differently.
    Sometimes it will go to failsafe when i am driving on the highway, sometimes when i start it in the morning. It can go without failsafe for a day or two and then sometimes it will bring up the failsafe 10 times in one day. so very inconsistent.

    In General I don't experience any harsh shifting or any transmission issue.

    When not on failsafe mode It will rev sometimes inconsistently. The RPM just goes up while on the same gear, once or twice while driving,
    The car will die sometimes when comes to a complete stop.

    The mechanic told me to change the entire transmission. I don't wanna believe that it's the tranny.

    Any suggestions ?

    The coils and spark plugs are all new. The battery is only a year old and it works really well.

    Is there any chance it can be one of the modules ? becuase it's so inconsistent and the car drives totally fine sometimes for up to 30 miles, i dont wanna believe its a hardware issue.
    Last edited by bmw525i2007; 04-23-2017 at 05:28 PM.

  2. #2
    Pelican Parts's Avatar
    Pelican Parts is offline Senior Member Supporting Vendor
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    '02 E39 Touring
    Have you had the codes read? This would be the first thing I would do - it'll give you a great place to start troubleshooting.


    -Dmitry
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  3. #3
    Join Date
    Apr 2017
    Location
    Burbank, CA
    Posts
    10
    My Cars
    2007 BMW 525i
    Yes ! the codes are
    P1727
    P0335 Crankshaft positioning sensor (A circuit)
    P0700 Transmission Control System (MIL request)

    Any idea what I should try first ? Really wanna fix it under $700

  4. #4
    Pelican Parts's Avatar
    Pelican Parts is offline Senior Member Supporting Vendor
    Join Date
    Aug 2013
    Location
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    My Cars
    '02 E39 Touring
    Based on some research, the following is suggested: Transmission control module (TCM) replacement. Repairing or replacing faulty wiring. Valve body replacement Transmission shift solenoid replacement. Unless you're able to clear the codes and repair yourself, a shop may need to address this.


    -Dmitry
    Your Trusted Source For DIY and Parts
    FREE SHIPPING over $99 click here
    BMW Parts | DIY Tech Articles | Facebook | Twitter | Instagram | YouTube | Promos
    888.280.7799 | 6am - 5pm PST



  5. #5
    Join Date
    Apr 2017
    Location
    Burbank, CA
    Posts
    10
    My Cars
    2007 BMW 525i
    It was JUST the Crankshaft Positioning sensor. The car works great now
    Parts $160 & Labor $250.

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