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      09-08-2014, 09:08 PM   #1
eocrm3
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DCT Transmission Temperature Warning???

I was driving home from work today, about 5 miles into the drive I stop at a red light....all of a sudden a warning message pops up on iDrive screen that stated to "avoid stop and go driving" .......the message also stated something about maintaining “continuous driving”.

During the warning the RPM bumped up to 1K RPM…the warning lasted about 10 seconds and as soon as the message disappeared off the screen the RPMs dropped to normal again.

I immediately did a systems check through iDrive and All Systems Check came back “Ok”.

A little background on my car:
2010 DCT
58K miles

All stock, no track use. Daily driver, daily usage is about 25 miles.
No prior engine or transmission issues.

I live in South Texas so we’re currently averaging around 97 degrees during the day. When this happened I had just exited freeway, non-aggressive driving right before message…..basically normal driving.

I called my SA at BMW Dealership and he said he would check with the shop foreman in the morning as he had never heard of this type of warning on m3s before. He told me just to monitor if the message reappears.

Any idea what the issue could be? I’m now paranoid that there might be an impending catastrophic DCT issue awaiting my car!
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      09-08-2014, 09:20 PM   #2
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How was your oil temp reading? Could just be an electronic gremlin if it's not recurring and you're not sensing anything is off.
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      09-08-2014, 09:25 PM   #3
eocrm3
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Oil temperature reading was right at 210.
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      09-08-2014, 09:26 PM   #4
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You weren't holding the car with the clutches on a hill, right? Instead of the brake
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      09-08-2014, 09:33 PM   #5
eocrm3
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No, car was on level road/street.....I had been stopped at a light for about 10 seconds before warning came on.

Also, I always drive on auto mode......with 3 m bars set for normal, daily driving.
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      09-09-2014, 12:26 AM   #6
tinman831
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You may want to check for tranny leaks in case you're low on fluid.
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      09-09-2014, 10:25 AM   #7
eocrm3
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I tried to get a good look at the car's undercarriage as best as I could without a lift, but don't see any signs of a leak, nor are there any oil stains underneath the car in my garage.

If the car would happen to be leaking or lacking DCT fluid, would there be a low fluid level indicator message? The same type of message that appears when the m3 prompts to add engine oil due to low level?
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      09-09-2014, 10:46 AM   #8
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The underneath of the DCT is covered by a panel which has drain holes...if you were losing enough fluid to cause an overheat its likely you would see signs on your garage floor.
Could be a faulty temp sensor in the DCT.
There is also a preheat system that directs the DCT fluid through an (engine coolant) heat exchanger to reduce the time it takes to reach normal operating temp - a fault here (some sort of sticking thermostat perhaps) might cause an overheat.
You know of course only the dealer can figure it out but it should be some reassurance that the DCT has proven to be incredibly reliable.
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