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      07-25-2018, 04:05 PM   #1
mbbx5
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How to program mechatronic?

My 2014 x3 35i was stuck in park yesterday and I got the generic drivetrain malfunction warning. Shut down and restart same thing. Shut down walked away for 20 min, came back and worked fine but had check engine warning. I drove it home and scanned codes. Has 420531 electronic transmission control output stages short to earth. All i come up with is the mechatronic needs to be replaced. I found bmw pn 24347647840 which I am confident I can install, the only issue I have is how to handle the programming/flash of the new unit. Anybody done this before? I havent found many people needing to do this on a 8 speed. It has 92k on it and has been otherwise flawless
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      10-09-2018, 10:34 AM   #2
mbbx5
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After clearing the codes the car worked for about a month and then the problem came back.

The mechatronic repair kits were out of stock and had to wait a few weeks which I didnt have.

I decided to try a used mechatronic and it worked. FYI if anyone has to do this in the future it is possible to use a salvaged mechatronic unit on a ZF8. After installing the unit I coded and programmed with ISTAP. After programming there were no diagnostic codes but the car would not shift out of park. The reason was because there is an ISN security code in the mechatronic (EGS module). To get around that I used a CGDI bmw programmer with the clear egs ISN authorization. After running the clear ISN function the used module is returned to new or virgin state and your car will automatically sync it up next time you start the car. All is good now. The only thing I would do differently in the future is not use ISTA/P. I would go with a different tool that allows you to work on just the module in question. With Ista I had to bring the whole car up to the current I level.
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      10-09-2018, 10:53 AM   #3
BMWZ4
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Wouldn't this be a warranty item?
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      10-11-2018, 04:03 PM   #4
lovebimmers
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Quote:
Originally Posted by BMWZ4 View Post
Wouldn't this be a warranty item?
Quote:
Originally Posted by BMWZ4 View Post
Wouldn't this be a warranty item?
His car is at 92k so I think the warranty is long gone
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      10-11-2018, 06:44 PM   #5
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Quote:
Originally Posted by lovebimmers View Post
Quote:
Originally Posted by BMWZ4 View Post
Wouldn't this be a warranty item?
Quote:
Originally Posted by BMWZ4 View Post
Wouldn't this be a warranty item?
His car is at 92k so I think the warranty is long gone
Ah, right. Last sentence in 1st post. Missed it obviously
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