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Thread: 2 new Alternators, new IBS, new IVM, new Oil Sensor, good Battery! So WTH???

  1. #1
    Join Date
    Dec 2015
    Location
    Brighton, MI
    Posts
    7
    My Cars
    2005 645ci

    2 new Alternators, new IBS, new IVM, new Oil Sensor, good Battery! So WTH???

    Current faults are 2E95 (DME: Generator) 2E8B (DME: Intelligent battery sensor) and no Oil temp reading but gauge cluster test passed.
    So far in attempts to correct these issues I have replaced two Alternators and installed new IBS, new IVM, new Oil Sensor, and I have a good Battery.
    I've been working on this car on and off for over a year now. Everything from interior repairs to removing the motor for other repairs and deep cleaning.
    I'm not easily stumped, but these last issues are doing me in. I think I've tried everything to no avail. I'm hoping someone will be willing to share some insight.
    I use ISTA and have a pretty complete shop. I own a small motorcycle dealership.

    Thanks for looking,

  2. #2
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    6,606
    My Cars
    99 840ci Sport Indv
    Do you have anything else connected to the battery negative terminal?

    When the these problems first start - what happened first?
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
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    Chase - Heroes to a generation

  3. #3
    Join Date
    Dec 2015
    Location
    Brighton, MI
    Posts
    7
    My Cars
    2005 645ci
    No, nothing else is connected to the battery and the car seems to be unaltered.

    The history of these issues:
    1- The existing alternator failed, so I replaced it with a re-man part (same manufacturer as the old one). Got the 2E95 fault, so I exchanged it and installed the second one, same fault again. Voltage reading from the alternator is 14.2 - 14.4v. taken from the alternator. Battery at rest stays about 12.25v.
    2- IBS fault came shortly after the installation of the first alternator.
    3- Oil temp gauge presented after re-installing the motor. I traced every wire from the sensor and could not find any damage.

  4. #4
    Join Date
    Jan 2007
    Location
    Atlanta, GA
    Posts
    5,310
    My Cars
    2017 Ram 2500d
    Those three parts communicate on the BSD line (bit-serial data). Something is preventing communication. It could be the DME.
    BMW Level 1 Master Technician
    2017 Ram 2500d
    2017 Jeep Grand Cherokee
    2014 Moomba Mobius LSV

  5. #5
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    2,240
    My Cars
    2001 525it
    I would take it to a good bmw independent shop for dx. and stop throwing parts at it

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