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Thread: Low Battery and Strange Noise from TPA in S54 Swapped Wagon

  1. #1
    Join Date
    Jul 2003
    Location
    Cleveland
    Posts
    29
    My Cars
    99 528i, 92 535im

    Low Battery and Strange Noise from TPA in S54 Swapped Wagon

    Hi all,
    I posted this over on E46fanatics, but so far no replies. I'm wondering if there is anyone with this experience here. I need some guidance on an issue I'm having with my S54 swapped wagon.

    From time to time, I'll go to start the car and the battery will be extremely low. This is an intermittent issue, so most of the time the car starts and cranks as normal after sitting for several days.

    I noticed recently there was a noise coming from the throttle body actuator area. This noise only happens when the car has been sitting for several hours AND the battery is low. See the video here: https://www.youtube.com/watch?v=FMRmUjbMTmk

    Could this be what is causing the electrical drain? What is that noise? Any idea how to troubleshoot this?

  2. #2
    Join Date
    Aug 2017
    Location
    Menlo Park
    Posts
    87
    My Cars
    '05 ///M3
    I would suggest posting on m3forum.net, that has the most support and folks for the e46 s54.

    Intermittent means it is electrical, most likely a short of some sort.

    When you scan for codes, does anything come up?

    Sent from my SM-G950U using Tapatalk

  3. #3
    Join Date
    Jul 2003
    Location
    Cleveland
    Posts
    29
    My Cars
    99 528i, 92 535im
    Thanks, I'll do that.

    Codes from the DME are:
    35[053] Interface, electric fan

    Shadow:
    2D[045] Electric throttle: servomotor <fault not currently present>
    2D[045] Electric throttle: servomotor <fault not currently present>
    35[053] Interface, electric fan
    and a few unrelated codes.

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