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DIY: Do It Yourself
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Old 04-03-2016, 06:24 PM   #1
Gem282
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Replacing faulty auto ECU

Hi, my auto ECU has an intermittent fault weather automatic transmission fault light comes on and the car goes into limp mode after turning the car ignition off for a few seconds and then starting egnition, the car goes back to normal, until the next time which could be the same day or a few weeks later.
I have had the sensors replaced and it hasn't fixed the problem so I have a 2nd hand replacement auto ECU.
Can someone please help me install/replace the faulty one?
Is it as simple as unplugging the old one and plugging in the new one and whereabouts do I find the auto ECU?
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Old 04-06-2016, 04:43 PM   #2
CarbonZHP
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The fault is probably in the transmission. I havent read too many (if any) stories of the TCM failing and causing errors
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Old 04-07-2016, 08:31 AM   #3
Gem282
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Do you mean the internal wiring of the automatic transmission to the computer?
The transmission oil has checked as well and it's clean oil.
I got the fault code read and it said it was a sensor fault, after checking the oil was clean we replaced the sensors but it hasn't fixed the problem.
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Old 04-16-2016, 02:40 AM   #4
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What fault code are you getting? What are the symptoms? Be specific.
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Old 04-16-2016, 06:50 AM   #5
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OP, you need to have the tranny computer scanned for codes. Find a reputable shop that specializes in BMWs. Don't throw parts at the problem. Doing so doesn't fix the problem, wastes your money and angers the BMW goddesses!
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Old 04-17-2016, 07:20 PM   #6
Gem282
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Fault code & symptoms

This is the fault reading:
059 EGS (electric transmission control) : stall speed (P0720).
We checked the oil to see if it was clean or dirty and it's clean so they replaced the sensors.
That didn't fix it either so thought next thing to do (was cheapest and less time consuming on the list of possible causes) so bought a second hand auto ECU.

Only happens when on a hot day, can be when driving for a couple of minutes or driving after hours, happens randomly, can be a day in between each time or weeks or months till it happens again.
Car goes into limp mode and the transmission light comes on.
Turn the car off for a couple of minutes and when I start the car again it's back to normal.
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Old 04-18-2016, 05:45 AM   #7
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The code is for the output shaft speed sensor circuit.
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